Hi

> is it possible to run FB 1.0 and FB 1.5 on the same machine at the same

time both using Port 3050?

Is is impossible in general to have 2 processes to run at the same port.
(Exception see below.)

> Would it cause problems running 2 applications (one on FB 1.0 and one on

FB 1.5) on Port 3050.

Is is simply impossible. (Exception see below.)
The first launched application will bind itself to the port and the second
application will print an error upon start: Cannot bind socket.

> Or is it neccessary to configure different ports for each server?

Yes. But you must see, that port numbers are subinformation behind the ip
number.
So, if you have two Ips on your machine, you have really TWO PORTS 3050.
You *CAN* have two different servers listening on the two ips.

(I am not sure, how to configure firebird for this though.)

Regards,
Steffen