Configuring your firewall on Windows XP
By default Windows will prompt you to allow Signal to receive incoming connections the first time the application is run. Selecting the default allow option will automatically create an exception for Signal in the Windows Firewall. However, if the firewall has been set to “Don’t allow exceptions” this will block all applications from receiving incoming connections, including Signal.
To verify Windows Firewall settings:
- Click on the Start Menu, click Control Panel, then click Security Center.
- Scroll down to the manage section and click Windows Firewall.
- If the firewall is off, no further action is needed.
- If the firewall is on, verify that "Don't allow exceptions" is unchecked.
- Click the Exceptions tab.
- In the Programs and Services list, verify that there is an entry for Signal and that it is checked.
- If there is no entry for Signal click "Add Program...".
- Select Signal from the dialog that appears and click OK.
In addition to the built-in Windows Firewall there are a number of third-party firewall solutions available, one of these may have been pre-installed on your computer or added as part of an internet security package. If any other firewall software is in use please consult the application’s documentation to determine how to add Signal as an exception. Signal uses TCP port 3569.