Likely your firewall is causing the issue. fbserver.exe on a server expects connection on 3050 and 3051 ports, make sure they're open. For outgoing data, a number of ports can be used by Firebird, please keep them open for the process, as well. Likewise, the client PCs will be using 3050 and 3051 ports for outgoing connection and the whole range of ports for incoming data.
I am unable to connect to my database over the network. What should I do?
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Please refer to the documentation of your firewall software.
How can you open 3050 and 3051?