Connection problems

[saycheese]

Ive been getting problems the last few days where the internet stops working and the only way to resolve it is to reboot my computer. It happened 3 times yesterday and twice today already and when it happens ive tried disabling and re-enabling the network connection,changing the proxy, changing browsers and clearing temporary internet files but a reboot seems to be the only solution.The 250 modem lights seem normal when this problem occurs with the power,enet,sync and ready lights on steady.Any help will be appreciated.

[Paul K]

Any firewalls on the PC? What operating system are you running, what browsers are in use, how are you using the connection when it fails (browsing, P2P, etc)?

[saycheese]

Paul,i'm using Windows XP Home SP2 with Norton Internet Security and the discconection occurs only when i'm browsing the net because yesterday i was downloading a file when it happened and the file kept downloading ok but i couldn't browse the net. The problem first happened about 10 days ago but it's been ok up until yesterday.
I use Firefox 99% of the time.

[Stuart]

As the problem doesn't appear to be NTL related, I have moved this to the Networking forum.

[saycheese]

Norton Firewall is causing the problem