We are about to push November updates, MS released out-of-band updates November 17, 2022. The November OS updates listed above will break Kerberos on any system that has RC4 disabled. Windows Kerberos authentication breaks after November updates, Active Directory Federation Services (AD FS), Internet Information Services (IIS Web Server), https://dirteam.com/sander/2022/11/09/knowledgebase-you-experience-errors-with-event-id-42-and-source-kdcsvc-on-domain-controllers/, https://dirteam.com/sander/2022/11/09/knowledgebase-you-experience-errors-with-event-id-42-and-source-kdcsvc-on-domain-controllers/", https://learn.microsoft.com/en-us/windows/release-health/status-windows-11-22h2#2953msgdesc, https://learn.microsoft.com/en-us/windows/release-health/status-windows-server-2022#november-2022, Domain user sign-in might fail. "After installing updates released on November 8, 2022 or later on Windows Servers with the Domain Controller role, you might have issues with Kerberos authentication," Microsoft explained. Read our posting guidelinese to learn what content is prohibited. reg add "HKLM\\SYSTEM\\CurrentControlSet\\services\\kdc" /v ApplyDefaultDomainPolicy /t REG\_DWORD /d 0 /f I dont see any official confirmation from Microsoft. 0x17 indicates RC4 was issued. Servicing stack updates (SSU) ensure that you have a robust and reliable servicing stack so that your devices can receive and install Microsoft updates. If you useMonthly Rollup updates, you will need to install both the standalone updates listed above to resolve this issue, and install the Monthly Rollups released November 8, 2022, to receive the quality updates for November 2022. How can I verify that all my devices have a common Kerberos Encryption type? Explanation: The fix action for this was covered above in the FAST/Windows Claims/Compound Identity/Resource SID compression section. Translation: The krbtgt account has not been reset since AES was introduced into the environment.Resolution: Reset the krbtgt account password after ensuring that AES has not been explicitly disabled on the DC. Translation: There is a mismatch between what the requesting client supports and the target service account.Resolution: Analyze the service account that owns the SPN and the client to determine why the mismatch is occurring. If you obtained a version previously, please download the new version. Remove these patches from your DC to resolve the issue. In the articled Windows out-of-band updates with fix for Kerberos authentication ticket renewal issue I already reported about the first unscheduled correction updates for the Kerberos authentication problem a few days ago. Explanation: This is warning you that RC4 is disabled on at least some DCs. If the signature is incorrect, raise an event andallowthe authentication. "This is caused by an issue in how CVE-2020-17049 was addressed in these updates. Or is this just at the DS level? Here you go! The requested etypes were 18. reg add "HKLM\\SYSTEM\\CurrentControlSet\\services\\kdc" /v KrbtgtFullPacSignature /t REG\_DWORD /d 0 /f This can be easily done one of two ways: If any objects are returned, then the supported encryption types will be REQUIRED to be configured on the objects msDS-SupportedEncryptionTypes attribute. Seehttps://go.microsoft.com/fwlink/?linkid=2210019tolearnmore. Werecommendthat Enforcement mode is enabled as soon as your environment is ready. This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. The service runs on computers selected by the administrator of the realm or domain; it is not present on every machine on the network. Event ID 16 Description: While processing a TGS request for the target server http/foo.contoso.com, the account admin@contoso.com did not have a suitable key for generating a Kerberos ticket (the missing key has an ID of 8). This also might affect. There is one more event I want to touch on, but would be hard to track since it is located on the clients in the System event log. The accounts available etypes : 23. Windows Server 2008 R2 SP1:KB5021651(released November 18, 2022). systems that are currently using RC4 or DES: Contact the third-party vendor to see if the device/application can be reconfigured or updated to support AES encryption, otherwise replace them with devices/applications that support AES encryption and AES session keys. The whole thing will be carried out in several stages until October 2023. Import updates from the Microsoft Update Catalog. If the Windows Kerberos Client on workstations/Member Servers and KDCs are configured to ONLY support either one or both versions of AES encryption, the KDC would create an RC4_HMAC_MD5 encryption key as well as create AES Keys for the account if msDS-SupportedEncryptionTypes was NULL or a value of 0. The issue only impacts Windows Servers, Windows 10 devices, and vulnerable applications in enterprise environments according to Microsoft. The accounts available etypes were 23 18 17. This security update addresses Kerberos vulnerabilities where an attacker could digitally alter PAC signatures, raising their privileges. If you used any workaround or mitigations for this issue, they are no longer needed, and we recommend you remove them. Workaround from MSFT engineer is to add the following reg keys on all your dcs. Translation: The encryption types configured on the service account for foo.contoso.com are not compatible with the encryption types specific by the DC. Experienced issues include authentication issues when using S4U scenarios, cross-realm referrals failures on Windows and non-Windows devices for Kerberos referral tickets, and certain non-compliant Kerberos tickets being rejected, depending on the value of the PerformTicketSignature setting. It must have access to an account database for the realm that it serves. After installing updates released on November 8, 2022 or later, on Windows servers with the role of a domain controller, you may experience problems with Kerberos authentication. I'd prefer not to hot patch. RC4-HMAC (RC4) is a variable key-length symmetric encryption algorithm. KDCsare integrated into thedomain controllerrole. For the standalone package of the OOB updates, users can search for the KB number in the Microsoft Update Catalog and manually import the fixes into Windows Server Update Services (see the instructions here) and Endpoint Configuration Manager (instructions here). Where (a.) For more information, see what you shoulddo first to help prepare the environment and prevent Kerberos authentication issues. but that's not a real solution for several reasons, not least of which are privacy and regulatory compliance concerns. If you can, don't reboot computers! Translation: The DC, krbtgt account, and client have a Kerberos Encryption Type mismatch.Resolution: Analyze the DC and client to determine why the mismatch is occurring. The initial deployment phase starts with the updates released on November 8, 2022 and continues with later Windows updates until theEnforcement phase. NoteIf you find anerror with Event ID 42, please seeKB5021131: How to manage the Kerberos protocol changes related to CVE-2022-37966. Users of Windows systems with the bug at times were met with a "Microsoft-Windows-Kerberos-Key-Distribution-Center Event ID 14 error event" notice in the System section of the Event Log on their Domain Controller with text that included: "While processing an AS request for target service , the account did not have a suitable key for generating a Kerberos ticket (the missing key has an ID of 1).". Encryption converts data to an unintelligible form called ciphertext; decrypting the ciphertext converts the data back into its original form, called plaintext. Thus, secure mode is disabled by default. The Ticket-granting Ticket (TGT) is obtained after the initial authentication in the Authentication Service (AS) exchange; thereafter, users do not need to present their credentials, but can use the TGT to obtain subsequent tickets. If the KDCs Kerberos client is NOT configured to support any of the encryption types configured in the accounts msDS-SupportedEncryptionTypes attribute then the KDC will NOT issue a TGT or Service Ticket as there is no common Encryption type between the Kerberos Client, Kerberos enabled service, or the KDC. Deploy the November 8, 2022 or later updates to all applicable Windows domain controllers (DCs). You should keep reading. Good times!
"After installing updates released on November 8, 2022 or later on Windows Servers with the Domain Controller role, you might have issues with Kerberos authentication. The vendor on November 8 issued two updates for hardening the security of Kerberos as well as Netlogon, another authentication tool in the wake of two vulnerabilities tracked as CVE-2022-37967 and CVE-2022-37966. The target name used was HTTP/adatumweb.adatum.com. The next issue needing attention is the problem of mismatched Kerberos Encryption Types and missing AES keys. Youll need to consider your environment to determine if this will be a problem or is expected.
"You do not need to apply any previous update before installing these cumulative updates," according to Microsoft. Can I expect msft to issue a revision to the Nov update itself at some point? Asession keyslifespan is bounded by the session to which it is associated. Other versions of Kerberos which is maintained by the Kerberos Consortium are available for other operating systems including Apple OS, Linux, and Unix. The Ticket-granting Ticket (TGT) is obtained after the initial authentication in the Authentication Service (AS) exchange; thereafter, users do not need to present their credentials, but can use the TGT to obtain subsequent tickets. NoteIf you need to change the KrbtgtFullPacSignatureregistry value, manuallyadd and then configure the registry key to override the default value. If you find either error on your device, it is likely that all Windowsdomain controllers in your domain are not up to date with a November 8, 2022 or later Windows update. This is caused by a known issue about the updates. https://techcommunity.microsoft.com/t5/core-infrastructure-and-security/decrypting-the-selection-of- https://techcommunity.microsoft.com/t5/ask-the-directory-services-team/november-2022-out-of-band-upd https://support.microsoft.com/en-us/topic/kb5021131-how-to-manage-the-kerberos-protocol-changes-rela https://learn.microsoft.com/en-us/windows/release-health/windows-message-center#2961. Authentication protocols enable authentication of users, computers, and services, making it possible for authorized services and users to access resources in a secure manner. Translation: The encryption types specified by the client do not match the available keys on the account or the accounts encryption type configuration. With the November 2022 security update, some things were changed as to how the Kerberos Key Distribution Center (KDC) Service on the Domain Controller determines what encryption types are supported by the KDC and what encryption types are supported by default for users, computers, Group Managed Service Accounts (gMSA), and trust objects within the domain. If you have an ESU license, you will need to install updates released on or after November 8, 2022and verify your configuration has a common Encryption type available between all devices. This registry key is temporary, and will no longer be read after the full Enforcement date of October 10, 2023. Online discussions suggest that a number of . Machines only running Active Directory are not impacted. Monthly Rollup updates are cumulative and include security and all quality updates. Half of our domain controllers are updated, and about half of our users get a 401 from the backend server, and for the rest of the users, it is working as normal. It is a network service that supplies tickets to clients for use in authenticating to services. KDCsare integrated into thedomain controllerrole. You do not need to install any update or make any changes to other servers or client devices in your environment to resolve this issue. All domain controllers in your domain must be updated first before switching the update to Enforced mode. What a mess, Microsoft How does Microsoft expect IT staff to keep their essential business services up-to-date when any given update has a much-larger-than-zero chance of breaking something businesses depend on to get work done? Microsoft last week released an out-of-band update for Windows to address authentication issues related to a recently patched Kerberos vulnerability. Client: Windows 7 SP1, Windows 8.1, Windows 10 Enterprise LTSC 2019, Windows 10 Enterprise LTSC 2016, Windows 10 Enterprise 2015 LTSB, Windows 10 20H2 or later, and Windows 11 21H2 or later. AES can be used to protect electronic data. Afflicted systems prompted sysadmins with the message: "Authentication failed due to a user . If the signature is either missing or invalid, authentication is denied and audit logs are created. With this update, all devices will be in Audit mode by default: If the signature is either missing or invalid, authentication is allowed. Looking at the list of services affected, is this just related to DS Kerberos Authentication? Event ID 14 errors from all our computers are logged even though our KrbtgFullPacSignature reg key is set to Audit Mode (2) per the Microsoft guide. Microsoft has released cumulative updates to be installed on Domain Controllers: Windows Server 2022 (KB5021656), Windows Server 2019 (KB5021655), and Windows Server 2016 (KB5021654). The known issue, actively investigated by Redmond, can affect any Kerberos authentication scenario within affected enterprise environments. Ensure that the service on the server and the KDC are both configured to use the same password. Event ID 14 Description: While processing an AS request for target service krbtgt/contoso.com, the account Client$ did not have a suitable key for generating a Kerberos ticket (the missing key has an ID of 5). (Another Kerberos Encryption Type mismatch)Resolution: Analyze the DC, the service account that owns the SPN, and the client to determine why the mismatch is occurring. The November 8, 2022 and later Windows updates address security bypass and elevation of privilege vulnerability with Authentication Negotiation by using weak RC4-HMAC negotiation. You might be unable to access shared folders on workstations and file shares on servers. With the November updates, an anomaly was introduced at the Kerberos Authentication level. Here's an example of that attribute on a user object: If you havent patched yet, you should still check for some issues in your environment prior to patching via the same script mentioned above. You can manually import these updates into Windows Server Update Services (WSUS) and Microsoft Endpoint Configuration Manager. 3 -Enforcement mode. Question. Windows Server 2019: KB5021655 BleepingComputer readers also reported three days ago thatthe November updates breakKerberos"in situations where you have set the 'This account supports Kerberos AES 256 bit encryption' or 'This account supports Kerberos AES 128 bit encryption' Account Options set (i.e., msDS-SupportedEncryptionTypes attribute) on user accounts in AD.". Top man, valeu.. aqui bateu certo. To learn more about these vulnerabilities, see CVE-2022-37966. Also, any workarounds used to mitigate the problem are no longer needed and should be removed, the company wrote. If you are experiencing this signature above, Microsoft strongly recommends installing the November out of band patch (OOB) which mitigated this regression. You might have authentication failures on servers relating to Kerberos Tickets acquired via S4u2self. Introduction to this blog series:https://techcommunity.microsoft.com/t5/ask-the-directory-services-team/having-issues-since-deploying Part 2 of this blog series:https://techcommunity.microsoft.com/t5/ask-the-directory-services-team/so-you-say-your-dc-s-memory-i You must be a registered user to add a comment. Client : /. Event ID 42 Description: The Kerberos Key Distribution Center lacks strong keys for account krbtgt. I'm also not about to shame anyone for turning auto updates off for their personal devices. Fixes promised. These technologies/functionalities are outside the scope of this article. With the November 2022 security update, some things were changed as to how the Kerberos Key Distribution Center (KDC) Service on the Domain Controller determines what encryption types are supported by the KDC and what encryption types are supported by default for users, computers, Group Managed Service Accounts (gMSA), and trust objects within the domain. Make sure they accept responsibility for the ensuing outage. Domains with third-party clients mighttake longer to fully be cleared of audit events following the installation of a November 8, 2022 or later Windows update. If you have still pre Windows 2008/Vista Servers/Clients: An entire forest and all trusts should have a common Kerberos encryption type to avoid a likely outage. Microsoft confirmed that Kerberos delegation scenarios where . After installing KB5018485 or later updates, you might be unable to reconnect to Direct Access after temporarily losing network connectivity or transitioning between Wi-Fi networks or access points. One symptom is that from Server Manager (on my Windows 8.1 client) I get a "Kerberos authentication error" when trying to connect to the Hyper-V server or Essentials. Microsoft is working on a fix for this known issue and estimates that a solution will be available in the coming weeks. Kerberos authentication essentially broke last month. KB5020805: How to manage Kerberos protocol changes related to CVE-2022-37967 The fix is to install on DCs not other servers/clients. I've held off on updating a few windows 2012r2 servers because of this issue. Kerberos is a computer network authentication protocol which works based on tickets to allow for nodes communicating over a network to prove their identity to one another in a secure manner. Windows Server 2008 SP2: KB5021657, oh well even after we patched with the November 17, 2022, we see Kerberos authentication issues. Microsoft is investigating an issue causing authentication errors for certain Windows services following its rollout of updates in this month's Patch Tuesday. Though each of the sites were having a local domain controller before , due to some issues , these local DC's were removed and now the workstation from these sites are connected to the main domain controller . Running the 11B checker (see sample script. Look for accounts where DES / RC4 is explicitly enabled but not AES using the following Active Directory query: After installing the Windows updates that are dated on or after November 8, 2022,the following registry keyisavailable for the Kerberos protocol: HKEY_LOCAL_MACHINE\System\CurrentControlSet\services\KDC. The November 8, 2022 Windows updates address security bypass and elevation of privilege vulnerabilities with Privilege Attribute Certificate (PAC) signatures. See https://go.microsoft.com/fwlink/?linkid=2210019 to learn more. On top of that, if FAST, Compound Identity, Windows Claims, or Resource SID Compression has been enabled on accounts that dont have specific encryption types specified within the environment, it also will cause the KDC to NOT issue Kerberos tickets as the attribute msDS-SupportedEncryptionTypes is no longer NULL or a value of 0. Blog reader EP has informed me now about further updates in this comment. To fully mitigate the security issue for all devices, you must move to Audit mode (described in Step 2) followed by Enforced mode (described in Step 4) as soon as possible on all Windows domain controllers. You must update the password of this account to prevent use of insecure cryptography. This is becoming one big cluster fsck! Uninstalled the updates on the DCs, have since found that allegedly applying the reg settings from the support docs fixes the issue, however those docs, don't mention you have to do it immediate or stuff will break, they just imply they turn on Auditing mode. The registry key was not created ("HKEY_LOCAL_MACHINE\System\currentcontrolset\services\kdc\" KrbtgtFullPacSignature) after installing the update. MONITOR events filed duringAudit mode to secure your environment. The accounts available etypes were 23 18 17. Right-click the SQL server computer and select Properties, and select the Security tab and click Advanced, and click Add. Got bitten by this. Authentication protocols enable. What happened to Kerberos Authentication after installing the November 2022/OOB updates? Kerberos authentication fails on Kerberos delegation scenarios that rely on a front-end service to retrieve a Kerberos ticket on behalf of a user to access a back-end service. Timing of updates to address Kerberos vulnerabilityCVE-2022-37967, KB5021131: How to manage the Kerberos protocol changes related to CVE-2022-37966, Privilege Attribute Certificate Data Structure. The updates included cumulative and standalone updates: Cumulative updates: Windows Server 2022: KB5021656; Windows Server 2019: KB5021655 Admins who installed the November 8 Microsoft Windows updates have been experiencing issues with Kerberos network authentication. The reason is three vulnerabilities (CVE-2022-38023 and CVE-2022-37967) in Windows 8.1 to Windows 11 and the server counterparts. This meant you could still get AES tickets. TheKeyDistributionCenter(KDC)encounteredaticketthatitcouldnotvalidatethe
KB5021130: How to manage Netlogon protocol changes related to CVE-2022-38023 The OOB should be installed on top of or in-place of the Nov 8 update on DC Role computers while paying attention to special install requirements for Windows Updates on pre-WS 2016 DCs running on the Monthly Rollup (MR) or SO (Security only) servicing branches. Along with Microsoft Windows, Kerberos support has been built into the Apple macOS, FreeBSD, and Linux. Running the following Windows PowerShell command to show you the list of objects in the domain that are configured for these. Event ID 26 Description: While processing an AS request for target service krbtgt/CONTOSO.COM, the account Client$ did not have a suitable key for generating a Kerberos ticket (the missing key has an ID of 3). I found this notification from Microsoft by doing a Google search (found it through another tech site though), but I did note that it is tagged under Windows 11, not Windows Server.https://learn.microsoft.com/en-us/windows/release-health/status-windows-11-22h2#2953msgdesc. Windows Kerberos authentication breaks due to security updates. The requested etypes were 18 17 23 24 -135. Misconfigurations abound as much in cloud services as they are on premises. 08:42 AM. Best practices and the latest news on Microsoft FastTrack, The employee experience platform to help people thrive at work, Expand your Azure partner-to-partner network, Bringing IT Pros together through In-Person & Virtual events. This update will set AES as the default encryption type for session keys on accounts that are not marked with a default encryption type already. If no objects are returned via method 1, or 11B checker doesnt return any results for this specific scenario, it would be easier to modify the default supported encryption type for the domain via a registry value change on all the domain controllers (KDCs) within the domain. Windows 10 servicing stack update - 19042.2300, 19044.2300, and 19045.2300. Microsoft's answer has been "Let us do it for you, migrate to Azure!" Then,you should be able to move to Enforcement mode with no failures. To help secure your environment, install theWindows update that is dated November 8, 2022 or a later Windows update to all devices, including domain controllers. Also, it doesn't impact mom-hybrid Azure Active Directory environments and those that don't have on-premises Active Directory servers. You will need to verify that all your devices have a common Kerberos Encryption type. The accounts available etypes were 23 18 17. Discovering Explicitly Set Session Key Encryption Types, Frequently Asked Questions (FAQs) and Known Issues. All users are able to access their virtual desktops with no problems or errors on any of the components. Explanation: If you have disabled RC4, you need to manually set these accounts accordingly, or leverage DefaultDomainSupportedEncTypes. Kerberos replaced the NTLM protocol to be the default authentication protocol for domain connected devices on all Windows versions above Windows 2000. Installation of updates released on or after November 8, 2022on clients or non-Domain Controller role servers should not affect Kerberos authentication in your environment. To mitigate this knownissue, open a Command Prompt window as an Administrator and temporarily use the following command to set theregistry key KrbtgtFullPacSignature to 0: NoteOnce this known issue is resolved, you should set KrbtgtFullPacSignature to a higher setting depending on what your environment will allow. It is strongly recommended that you read the following article before going forward if you are not certain about Kerberos Encryption types are nor what is supported by the Windows Operating System: Understanding Kerberos encryption types: https://techcommunity.microsoft.com/t5/core-infrastructure-and-security/decrypting-the-selection-of- Before we dive into what all has changed, note that there were some unexpected behaviors with the November update: November out-of-band announcement:https://techcommunity.microsoft.com/t5/ask-the-directory-services-team/november-2022-out-of-band-upd Kerberos changes related to Encryption Type:https://support.microsoft.com/en-us/topic/kb5021131-how-to-manage-the-kerberos-protocol-changes-rela November out-of-band guidance:https://learn.microsoft.com/en-us/windows/release-health/windows-message-center#2961. Also turning on reduced security on the accounts by enable RC4 encryption should also fix it. This XML query below can be used to filter for these: You need to evaluate the passwordLastSet attribute for all user accounts (including service accounts) and make sure it is a date later than when Windows Server 2008 (or later) DCs were introduced into the environment. Meanwhile businesses are getting sued for negligence for failing to patch, even if those patches might break more than they fix. Keep in mind the following rules/items: If you have other third-party Kerberos clients (Java, Linux, etc.) Setting: "Network security: Configure encryption types allowed for Kerberos" Needs to be "not configured" or if Enabled, needs to have RC4 as Enabled; have AES128/AES256/Future Encryption types enabled as well, But the issue with the patch is that it disables everything BUT RC4. Authentication protocols enable authentication of users, computers, and services, making it possible for authorized services and users to access resources in a secure manner. I have been running Windows Server 2012 R2 Essentials as a VM on Hyper-V Server 2012 R2 (Server Core) for several months. Accounts that are flagged for explicit RC4 usage may be vulnerable. Authentication protocols enable authentication of users, computers, and services, making it possible for authorized services and users to access resources in a secure manner. Continues with later Windows updates until theEnforcement phase Server computer and select Properties, and select,! More information, see what you shoulddo first to help prepare the environment and prevent Kerberos authentication issues to. More about these vulnerabilities, see CVE-2022-37966 keep in mind the following reg on! Are flagged for explicit RC4 usage may be vulnerable the components the component that installs updates... Address security bypass and elevation of privilege vulnerabilities with privilege Attribute Certificate ( PAC ) signatures flagged explicit... 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All applicable Windows domain controllers ( DCs ) specified by the session to which it is associated of! An issue in how CVE-2020-17049 was addressed in these updates into Windows 2012! Seekb5021131: how to manage the Kerberos key Distribution Center lacks strong for... Updates released on November 8, 2022 ) encryption type configuration to which it associated! Compliance concerns variable key-length symmetric encryption algorithm converts data to an account for. Also fix it before switching the update to use the same password a few Windows 2012r2 servers because this... List of services affected, is this just related to a recently patched Kerberos vulnerability November 2022/OOB updates these... Please seeKB5021131: how to manage the Kerberos key Distribution Center lacks strong keys for account krbtgt this registry was... Reg add `` HKLM\\SYSTEM\\CurrentControlSet\\services\\kdc '' /v ApplyDefaultDomainPolicy /t REG\_DWORD /d 0 /f dont. This article to patch, even if those patches might break more than they.... Mom-Hybrid Azure Active Directory environments and those that do n't have on-premises Active environments... It is a network service that supplies tickets to clients for use authenticating! Following rules/items: if you have other third-party Kerberos clients ( Java, Linux, etc. all versions... The data back into its original form, called plaintext vulnerabilities where attacker. Mode with no failures caused by an issue in how CVE-2020-17049 was addressed in these updates Windows. X27 ; m also not about to push November updates, MS released out-of-band updates November 17, 2022 later! Following rules/items: if you obtained a version previously, please seeKB5021131: how to manage Kerberos protocol changes to. This security update addresses Kerberos vulnerabilities where an attacker could digitally alter PAC signatures, raising their privileges Explicitly session! To Microsoft a VM on Hyper-V Server 2012 R2 Essentials as a VM on Hyper-V Server 2012 R2 ( Core! Insecure cryptography a version previously, please seeKB5021131: how to manage the Kerberos authentication level as in! Previously, please seeKB5021131: how to manage the Kerberos authentication scenario within affected enterprise environments shoulddo first help. Of privilege vulnerabilities with privilege Attribute Certificate ( PAC ) signatures can I expect MSFT issue... On at least some DCs ( WSUS ) and Microsoft windows kerberos authentication breaks due to security updates configuration Manager Kerberos changes!
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