Hi.
Today I had this situation - on CentOS 7 server, while Firebird Superserver was working, suddenly it stopped receiving new connections. First I thought that the server was crashed and not started automatically from the guardian. But ps -aux | greb fb showed that there are 2 firebird processes running - fbguard and fbserver.

So I stopped it manually with systemctl stop firebird-superserver. Then in the log I saw a message that server is shutting down with 190 connections to 19 databases indicating that there were working connections.

Is there a limitations for the number of connections in Superserver or this is a limitation of the OS?
Because the number 190 is strange.