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Set maximum Kerberos SSPI context token buffer size

This policy setting allows you to set the value returned to applications which request the maximum size of the SSPI context token buffer size. The size of the context token buffer determines the maximum size of SSPI context tokens an application expects and allocates. Depending upon authentication request processing and group memberships the buffer might be smaller than the actual size of the SSPI context token. If you enable this policy setting the Kerberos client or server uses the configured value or the locally allowed maximum value whichever is smaller. If you disable or do not configure this policy setting the Kerberos client or server uses the locally configured value or the default value. Note: This policy setting configures the existing MaxTokenSize registry value in HKEY_LOCAL_MACHINE -> SYSTEM -> CurrentControlSet -> Control -> Lsa -> Kerberos -> Parameters which was added in Windows XP and Windows Server 2003 with a default value of 12000 bytes. Beginning with Windows 8 the default is 48000 bytes. Due to HTTP’s base64 encoding of authentication context tokens it is not advised to set this value more than 48000 bytes.


Additional Information

  1. Registry path is:

    HKEY_LOCAL_MACHINE -> System -> CurrentControlSet -> Control -> Lsa -> Kerberos -> Parameters # EnableMaxTokenSize; HKEY_LOCAL_MACHINE -> System -> CurrentControlSet -> Control -> Lsa -> Kerberos -> Parameters # MaxTokenSize

  2. The Administrative Template path is:

    System -> Kerberos

Notes

* Making mistakes while changing registry values can affect your system adversely. We recommend you to create a System Restore point before making registry manipulation. If you're new to Registry Editor, read this beginner's guide.
** To locate the registry and administrative template path, checkout beginner's guide.
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