Hi everybody,
I did some investigations as the error now appears permanently.
Debug log shows this:
99] 2014-11-21 09:05:54 ("$PATH: integ/exch2010/PowerShellInterface.cpp $ $Rev: 33960 $ $Date:: 2012-10-04 13:17:58 +05":134)
[ 99] <<=== (3) } /* CPowerShellInterface::Core */
[ 99]
[ 30] [CPowerShellClient::CheckUserBelongsToGroup] Failed to CheckUserBelongsToGroup 'Unknown error (0x5011)
Information about this error are pointing to a MS hotfix:
http://support.microsoft.com/kb/969166/en-us
I am going to put this on my server on next occasion.
Will keep you posted.
Regards,
Thomas