SERVER/process_packet: broken port, server exiting

This error message means that client side broke the connection unexpectedly. Possible reasons are hard reset or power off (loss of electric power also), application killed by force (via Task Manager on Windows or kill/killall on Linux) or some network hardware related problem. It indicates that the server cannot transmit or receive data anymore.

When you see this, there should be another message before it in firebird.log file, which would give you the exact host network code and help you understand what's going on. Those network codes are explained in FAQ #119 (for Windows server) and FAQ #120 (for Linux server).