I have been pouring over the MSDN on this problem and am comming up without any answers. I have a COM object on a NT4.0 Workstation in Domain X. I can call oMyObj=CreateObjectx(lcComID,lcIP_Address) from my workstation. Then I can call a Function in that remote object. and it works. I have another programmer on ISDN that is an Admin on that COM NT4.0 Workstation. He gets "RPC server unavailable" He can Ping the Machine with the COM object by name. I have had this same problem when I am logged in at home on a 56K line. We have never had a problem going across Domains to access COM before. Is there something about a slower connection that causes problems and if so does anybody know how to fix it? Thanks in advance.