![]() ![]() Possible values: 0 (false) or any non-zero value (true) This value is the lifetime of tickets that are obtained by S4U proxy requests. This value is the lifetime of the S4U negative cache entries that are used to restrict the number of S4U proxy requests from a particular computer. However, the SPNCacheTimeout value is also used to reduce the SPN cache to a manageable size - when the SPN cache reaches 350 entries the system will use this value to scavenge / cleanup old and unused entries. ![]() Valid SPN cache entries (for example, not negative cache) are not deleted after 15 minutes of creation. Clients and member servers use this value to age out and purge negative cache entries (SPN not found). On domain controllers, the SPN cache is disabled. This value is used by the system when purging Service Principal Names (SPN) cache entries. For more information, see Problems with Kerberos authentication when a user belongs to many groups. Microsoft recommends that you set this value to less than 65535. This value is the maximum value of the Kerberos token. Starting Windows Server 2012 and Windows 8, the default value is 48000. This macro enables events that are related to SPN cache hits and misses.ĭefault Value: 12000 (Decimal). This macro enables Winsock-related events. This macro enables user API tracing that is used together with DEB_TRACE_API and that is found mostly in Userapi.cxx. This macro enables the time skew tracing that is found in Timesync.cxx. This macro enables extra context tracing. ![]() This macro enables tracing before and after calls to KerbMakeKdcCall(). This macro enables logon tracing such as in LsaApLogonUserEx2(). This macro enables logon session tracing. This macro enables user API tracing events that are logged on entry and on exit to an externally exported function that is implemented through SSPI. This macro enables general tracing events. In some cases, these messages can be ignored. This macro generates warning messages across components. It produces error messages across components. It's the default InfoLevel for checked builds. If this level of troubleshooting is required, contact microsoft support for assistance. Some of the below output requires checked version of kerberos.dll (for example the DEB_TRACE_SPN_CACHE). This kind of logging can be collected on the component level of Kerberos by bitwise or by one or more of the macros that are described in the following table. This value is a list of flags that indicate the type and the level of logging that is requested. This value is the number of KDC referrals that a client pursues before the client gives up. This value contains a flag that indicates whether to use 128-bit encryption for datagram packets. It's the time-out value that's used to invalidate a domain controller in the same site in the domain controller cache. It's the time-out value that's used to invalidate a domain controller from a different site in the domain controller cache. When you want to use AES, set the value to one of the following values: ![]() This value indicates the default encryption type for pre-authentication.ĭefault value is RC4 is 23 (decimal) or 0x17 (hexadecimal) This value is the number of times that a client will try to contact a KDC. This value is the time between successive calls to the KDC if the previous call failed. This value is the time Windows waits for a response from a KDC. This value is the time that Windows waits for the KDC to start before Windows gives up. The default for this value in Windows Vista and later version of Windows is 0, so UDP is never used by the Windows Kerberos Client. If the packet size exceeds this value, TCP is used. This value is the maximum User Datagram Protocol (UDP) packet size. For more information, see How to enable Kerberos event logging. Therefore, do not assume that you have a Kerberos problem when you see an event logged based on this setting. The events logged may include false positives where the Kerberos client retries with different request flags that then succeed. ![]()
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