> 1024.

<<Actually, in Fb 3, it is 2048. And the "hard limit" applies only to
Superserver mode. The other modes can take as many connections as the
machine can resource. With 2GB RAM, that is not a lot. That machine
would be seriously under-resourced for Classic and not suitable for SC
at all.>>

Being pedantic - 2.5.3+ and 3.0+ http://tracker.firebirdsql.org/browse/CORE-4439
The limit applies to Windows... SS & SC. But not Classic.
This limit could be increased if needed. Its not a hard limit

https://msdn.microsoft.com/en-us/library/windows/desktop/ms739169%28v=vs.85%29.aspx

Paul