This may help someone. Or you may help me gain better insight with
comments.

Hello MyClient

By installing Windows XP SP2 on your DB server you have installed a
new firewall. Before the Firebird engine can receive and process
requests you must tell the firewall to allow these requests. In your
case this is simple.

Use Start – Control Panel
- Security Center
- Windows Firewall
- Exceptions
- Add Port:
o TCP = Yes
o Name = Firebird 1.5 (or make up your own name)
o Port = 3050
o SetScope = My Network

Then press the [Apply] or [OK] buttons to accept these changes. This
should allow your Firebird Engine on your XP SP2 machine to accept
database requests and process them.

I rebooted the server but am not sure if this is required.

Russell Belding