I'm trying to connect to a FB 3.0 database. Using a cpLocal connection, all goes fine. But when I switch to TCP/IP and change the Database Path to MyServer:C:\path\mydb.fdb, I get the "connection rejected by remote interface" message.

If I use the 2.5 format of the same database and switch to FB 2.5, I can also connect via Local setting, but with TCP/IP I get "unsupported on-disk structure for file...".

I already checked the DLL versions being used in each case and every previous [IBO] message I could find, but with no success. The server and client are both the same machine, recently formatted.