The problem seems to be server specific.
The first case is when the PDC of the BMCEN01 domain acts as the RPC server. A message is logged by the KXRPC service in the event log stating that a domain controller for the BMCEN01 domain could not be found!
The second case is where one of the BDCs acts as the RPC server; everything's fine.
The third case is when a server from a different domain acts as the RPC server. This server is not mentioned in the KIXTART.INI file or any of the other ways of naming the RPC server. The only common link is that the client PC has it's workgroup set to the same name as the domain the PDC's in.
A PC with workgroup BMFIN02 logs on to BMCEN01 domain. Sometimes \\fin02pc the PDC of the BMFIN02 domain acts as the clients RPC server. When that happens the "ingroup" function calls fail because \\fin02pc doesnt contain any groups. Next post will have the event log messages. It's 3:30am here and I've had enough of Kixtart for today or should that be yesterday?