Hm read this:
http://grc.com/port_113.htm

Uninstall all firewalls and use RegSeeker or JV16 PowerTools and search for firewall name entries with Registry Finder and delete them (for all firewalls you used). Restart machine and install Outpost again. Now test it.

To delete registry enries use like this example:
For ZoneAlarm:
zonelabs
zonealarm