> We have 3 programs here.
> 2 of them uses IBX components and 1 uses IBObjects.
>
> If we do not use the program using IBObjects there a connections to the firebird server using port 3050.
> But the program using IBObjects also create connections using a lot of other ports.
>
> Why is that, and is this something I can control?

By using Firebird events via the TIB_Events or the TIB_SyncCursor
component. Per default, Firebird uses local random TCP ports for event
communication to the server.

You can use the RemoteAuxPort configuration parameter in firebird.conf
to use a user-defined TCP port, although with Firebird 2.1 and prior,
this is a SuperServer settings only. In Firebid 2.5, this should work
with Classic as well.

HTH.

--
Best Regards,
Thomas Steinmaurer
LogManager Series - Logging/Auditing Suites supporting
InterBase, Firebird, Advantage Database, MS SQL Server and
NexusDB V2
Upscene Productions
http://www.upscene.com
My blog:
http://blog.upscene.com/thomas/