Token-based server access validation failed

After installing the first SQL Server 2008 R2 in a new domain, I got this error when I tried to log on the database instance:
2011-04-14 13:46:51.35 Logon       Error: 18456, Severity: 14, State: 11.
2011-04-14 13:46:51.35 Logon       Login failed for user 'SANDBOX\myadministrator'. Reason: Token-based server access validation failed with an infrastructure error. Check for previous errors. [CLIENT: <local machine>]

A restart of the database service did not help. Neither did a "Run as administrator" to circumvent the UAC.
A discussion on SQL Server Central showed me the way.
I logged off all computers in the domain to refresh my security token, and then a login could be done - also without "Run as administrator"


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