What is Max token size?
The maximum allowed value of MaxTokenSize is 65535 bytes.
How do I know my user token size?
Token Size = 1200 + 40d + 8s s: The number of security global groups that a user is a member of plus the number of universal groups in a user’s account domain that the user is a member of.
Where are Kerberos tokens stored Windows?
The KDC is responsible for verifying a user’s credentials and issuing them with Kerberos tokens. In the case of Windows, for example, the KDC is the domain controller. Once issued, the token is stored on that user’s computer, in a local cache associated with that user.
How do I fix token bloat?
How to Fix Token Bloat? By overriding the default value of “MaxTokenSize” registry entry, which is located under System\CurrentControlSet\Control\Lsa\Kerberos\Parameters, you can avoid the token bloat error during the login.
How do I check my Kerberos status?
You can view the list of active Kerberos tickets to see if there is one for the service of interest, e.g. by running klist.exe. There’s also a way to log Kerberos events if you hack the registry. You should really be auditing logon events, whether the computer is a server or workstation.
How do you fix Kerberos?
Resolution. To resolve this problem, update the registry on each computer that participates in the Kerberos authentication process, including the client computers. We recommend that you update all of your Windows-based systems, especially if your users have to log on across multiple domains or forests.
Does Windows use Kerberos by default?
What is Kerberos? Kerberos authentication is currently the default authorization technology used by Microsoft Windows, and implementations of Kerberos exist in Apple OS, FreeBSD, UNIX, and Linux. Microsoft introduced their version of Kerberos in Windows2000.
Does Active Directory use Kerberos by default?
Active Directory Domain Services is required for default Kerberos implementations within the domain or forest.
What causes token bloat?
Token Bloat occurs when you are a member of too many groups in Active Directory. At somewhere around 125 groups, your Kerberos token size reaches 64kb in size. That’s the limit for a lot of things that use Kerberos authentication.
How do I check my Kerberos lifetime ticket?
Describes the Kerberos Policy settings and provides links to policy setting descriptions.
What’s the maxtokensize for Windows Server 2012?
UPDATE: So after a bit more reading on this I can see that the in Server 2012 the default is set to 48000 for the MaxTokenSize. This looks like a sensible option for us to adopt.
How big is the maxtokensize buffer in Windows?
The default MaxTokenSize buffer size since the Windows 2000 time frame up to Windows 7/2008 R2 was 12,000 bytes. The release of Windows 8/2012 bumped the default MaxTokenSize buffer up to 48,000 bytes.
What’s the maximum maxtokensize size for the registry?
The maximum allowed value of MaxTokenSize is 65535 bytes. However, because of HTTP’s base64 encoding of authentication context tokens, we do not recommend that you set the maxTokenSize registry entry to a value larger than 48000 bytes.
What happens when you increase the maxtokensize in IIS?
The issue is that increasing the MaxTokenSize also increases the size of the authentication header that is encapsulated in the HTTP request which can violate the configured size limits within IIS. While the simple fix is to remove the user from any groups that are no longer required, that is rarely an acceptable fix in the real world.