> Are you certain that *service* you installed is fbserver.exe? Have you looked at the Properties of the Firebird service, to see which executable it is running?

Yes. I am sure the service is "fbserver.exe". Here are the information:

Service Name: FirebirdServerDefaultInstance
Command Line: "c:\program files\Firebird\Firebird_1_5\bin\fbserver.exe" -s

I change IpcName in firebird.conf located in "c:\Program files\Firebird\Firebird_1_5\firebird.conf"

Is there anything I miss?