Quote:
The browser gives me a "DNS error or server cannot be found" error.


Ah, the catch-all Internet Explorer error. It could mean any of the following:

1. No DNS.
2. No route to the server.
3. Nothing listening on port 80 on the server.
4. Connection dropped after connecting to port 80 on the server.

You have to diagnose each one in turn. nslookup will help you diagnose (1). tracert (or traceroute will help you diagnose (2), and telnet or netcat will help you diagnose (4).

Obviously, if you're having this problem with every website you contact, then it's not (3) or (4). If other traffic's working fine, then it's probably not (1) or (2).

What can sometimes cause this problem in IE is if you've got a misconfigured (or misdetected) proxy.
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-- roger