A mismatch was detected between the user-supplied real-RDB-name and the real-RDB-name that was derived from the user-supplied alias-RDB-name using the sqlhosts file.
Check the spelling of the user-supplied real-RDB-name. Ensure that the user-supplied alias-RDB-name is the correct one.
If SNA network protocol is used to connect to the application server, check the real-RDB-name column (the "hostname" field) in the "sqlhosts" file for the alias-RDB-name entry, and check that it is spelled correctly.
If TCP/IP network protocol is used to connect to the application server, check the "RDB=real-RDB-name" option (in the "options" field) in the "sqlhosts" file for the alias-RDB-name entry, and check that it is spelled correctly.