DCOM CoCreateInstanceEx 0x80040155

Question

DCOM client is situated under WIN server 2012, DCOM server is located under WIN XP. When I call CoCreateInstanceEx it returns 0x80040155 "Interface not registered".

Actions that were already performed:

• Register COM classes on the serverside via MyApp.exe /regserver
• Checked the registry (on server side) if the appropriate APPIDs and interface CLSIDs are there.
• Configured DCOM on the server side via DCOMCNFG(based on this link)
• Also enabled DCOM on the client side via DCOMCNFG
• Enabled DCOM event logging via ActivationFailureLoggingLevel and CallFailureLoggingLevel registry keys -> no errors found in event log.

Though I've performed above steps I still the 0x80040155 error code from CoCreateInstanceEx.

Is there a way to enable additional DCOM tracing on the server side, to get more information why 0x80040155 is returned?

Any additional hints to get rid of this problem?

thx

Answer 1

Be aware that you also have to register COM server interface on your client machine, otherwise you might get above described error code.