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Originally Posted by rdhw
NTL don't proxy FTP. If it's only one of your LAN PCs affected, then you need to study the setup of that one PC carefully. If it is a Windows system, run HijackThis on it to see if there are any unexpected components present.
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Thanks for answering...
But way back at the beginning I explained that the problem was not restricted to simply one PC..
I'll fill in some of the blanks...
1) The modem is a Surfboard 3100 ethernet modem going into a smoothwall based firewall.
2) Currently using passive FTP. May try using active FTP to see if that helps (I'll open up the ports from just the server in question).
3) Problem has only occurred in the last few (5 maybe) weeks.
4) Pinging the server always works with good <35ms delays.
5) I tried an FTP session to the same server from a friends ADSL account (using my firewall and my client) and as expected the process was flawless.
6) I have tried both linux and Windows clients, the symptoms are the same for both.
7) FTP to upload.ntlworld.com works fine - always. Even on a machine that is suffering a problem with getting to the server in question.
8) When the problem occurs FTP packets start to take up to 2 minutes to arrive at the server - all packets from any client not suffering the problem arrive within 30ms or so.
The bottom line is that strangeness is going on. Most strange is that when one client stops working for 30mins or so the others will all still work, until they fail and then behave as explained.
It sounds like some router somewhere is throwing a wobbly and waiting to time out and reset itself.......