(cross-post added to XP Networking)
"bnmohan via WindowsKB.com" u35859@uwe wrote in message
news:75a59cfc37fec@uwe...
I have a problem which I cannot explain : in my office, I have an XP SP2
machine running Norton SBS 10.1 which acts as the mail server. I have two
broadband connections from two different ISPs. Through one, there is
absolutey no problem When I shift to the other, Internet access if perfect,
accessing POP3 accounts, but accessaing my SMTP server : waits for ever. Or
sort of. Suddenly, after say 15 minutes, the mails go. And then again, server
timeout.
When I get back to the first ISP, absolutely no problem. I checked with my
Web Site hoster, and they replied that theuy have not blocked SMTP access to
the address space that the second ISP uses.
It's not clear what your "Web Site hoster" has to do with your problem SMTP
service. Is that one of your ISPs? Which one?
BTW, on the first ISP, I have a static IP, while on the second I get a
dynamic IP. The proxy server is Freeproxy, but the problem remains even if
the proxy is bypassed by the email client on the mail server.
Any ideas?
Sounds as if the dynamic IP address is not being used?
Have you tried forcing it to be used? I'm not sure how to do that.
Perhaps just powering off the network adapter with the static address?
ipconfig /all and netstat -r (commands for cmd window)
might provide more clues. Also is a router involved?
Otherwise probably the clearest clues about what is happening
would be found in a packet trace or other network diagnostic
which can show the IP addresses being used to transport the SMTP
request. E.g. if it is being done by the other ISP's IP address
it would be clear that it would appear as a request from an unknown
possibly unauthorized poster and hence perhaps be ignored.
If the second request (after the timeout) was sent using the ISP's IP address
then it would appear authorized and not be ignored. Etc.
A potential solution would be to use an authenticating SMTP protocol
(e.g. using a different port than 25, which does not require authentication.)
BTW solving multi-home issues like this would probably be best done
in a newsgroup which specializes in networking. Cross-posting for convenience.
Good luck
Robert Aldwinckle
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Mohan
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