Dear all,
I posted a related error last week.
Our environment consists of a master domain and several subdomains with users traveling around. User accounts are located in the subdomain.
User A ist homed in domain A. If user A uses a PC in domain A no problem.
If the user logs in from a machine in any other domain e.g. B we get problems e.g with the ingroup() function. We tried calling the function with and without leading domain ("ABC\GroupA" and "GroupA").
The domain is relying only on DNS. No WINS is installed.

Any idea what could be the issue?