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Originally Posted by Hodders
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 accept the point made about tcpdump.
6) The zen adsl test is done by setting the gateway address to the other end of a VPN to a different office, causing the traffic to go via a ipsec tunnel between the two. From our Bristol office that traffic then goes off to our colocated webserver.
The bottom line is that strangeness is going on. Most strange is that when one client stops working for 30mins or so the opther will all still work, until they fail.
It sounds like some router somewhwre is throwing a wobbly and waiting to time out and reset itself.......
Ho hum... Lets see if active ftp makes any diference.
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Does the problem occur without the router/smoothwall box in the equation?
You really need to eliminate those 1st.