Failed to locate host machine. Undefined service gds_db/tcp
Usually Firebird install should add the gdb_db service to your system. However, if you install manually, or don't have required privileges or some other software deletes it - it may happen that gdb_db service is not defined. It can also happen if you try to access Firebird on another machine. To fix this on Windows, add the following line to %windir%\system32\drivers\etc\services:
gds_db 3050/tcp fb #Firebird
%windir% is the installation directory of your Windows, for example C:\WINNT. On Linux, add the following line to /etc/services:
gds_db 3050/tcp # Firebird
You might need to restart the application that reported the error after these changes. Please note that you should add this line on the computer where the error is reported.