Hi! 24 July
Thanks a lot. And sorry about the typing errors.
I have two adaptors on the mail server : one connected to the local office
lan, the other to the broadband router.
When I connect to the static IP ISP, the static IP terminates on the adaptor,
the gateway being the router IP, and the router is in bridge mode. By
connecting I mean a lan cable between the router and the lan card.
When I connect to the triband dyanmic IP ISP (I remove the lan cable from
the earlier router and connect it to the second one), I change the ip address
of the adaptor to 192.168.1.xxx, with gateway 192.168.1.1 (on the triband
router).
By Website Hoster I mean the company who host my domain : If they have for
some reason blocked access to the SMTP port for addresses in the space 59.184.
xxx.xxx, then no mails ever would move. But some do : once in say 15 or 20
mins, or even more. But POP3 access is NO problem, nor is access to the
internet.
And I used both the connections without any problem earlier (some three four
weeks earlier: I used to alternate between the two)
I therefore think the problem lies with my ISP, but I am not able to prove
anything.
Mohan
Robert Aldwinckle wrote:
(cross-post added to XP Networking)
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
[quoted text clipped - 6 lines]
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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