From Support Wiki
After you have installed Service Pack 2 for the XP operating system, you will discover that you will not be able to connect to a SQLBase Server running on that machine from another machine. This is because SP2 runs its firewall program by default, resulting in the port on which SQLBase listens for TCP/IP communications to be blocked from interaction from outside the firewall.
In order to allow users from other machines to access SQLBase, you must open the port on which SQLBase is listening (2155 by default) to outside traffic. Doing this is quite easy. Simply follow the steps below.
1. Click "start" to open the main XP directive menu.
2. Click "Control Panel" to invoke the Control Panel applications.
3. Double-click the "Windows Firewall" application to open its dialogbox.
4. Choose the"Exceptions" tab.
5. Click the "Add Port"push button.
6. Ensure the "TCP" radio button is active.
7. In the "Name" datafield, type "SQLBase" or other meaningful description.
8. In the "Port" datafield, type "2155" if the default port is being used.
9. Click "Ok" to finish the operation.
If you are using a port other than 2155 you should, of course, type in that port at step 8. SQLBase will now be available to access from the outside world.