After a system crash I hade to reformat the hard disk and reinstall Windows and all software. After reinstallation, Limewire cannot connect to the Gnutella network.

My system details:
1. OS: Windows XP SP 3.
2. Firewalls: Norton Antivirus - and Spyware Doctor (but that is not a firewall?). Anyhow, I have given Limewire permission to access the Internet on both programs. The Windows firewall is deactivated.
3. RAM: 4 GB
4. Avalable hard disk space 43 GB
5. Connection type: ADSL 8 Mbs
6. Modem: Alcatel SpeedTouch
7. Connecting from home (freelancer)
8. Limewire version: 4.12.6
9. ISP: Telia Sonera Sweden
10. Checking http://www3.limewire.com:6346/ gives the reply 'Your test worked!'.
11. This is not a shared connection
12. LW has worked perfectly earlier on the same computer with virtually the same configuration and the same ISP
13. Yes, there is a brick wall in front of the blue world icon at the bottom of LW's interface
14. For those using a modem/router, how is your modem/router set up...are you port forwarding or is UPnP enabled? Have tried both with no success
15. What security programs are you using (antivirus etc)? – See item 2.
16. What country are you living in? Sweden.
17. Has anything in your setup changed recently? - Have reinstalled OS and all software, but in principle with the same configuration as before.

I might add that I have a similar problem with the external backup service (over the Internet) that I am using – I get the error message that a firewall is blocking the Internet connection, although I have given the backup program permissions to access the Internet.