When Adaptive Server issues an RPC to an access service, it attempts to connect using a service name identical to the Adaptive Server identifier in the Windows sql.ini file or the UNIX interfaces file.
Define a service within the access service library using the same name as Adaptive Server, using the previous procedure, or,
Set up a service name redirection to redirect the Adaptive Server to the appropriate service.
See Enterprise Connect Data Access and Mainframe Connect Server Administration Guide > Service Name Redirection.