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Only for Smart Minds - Exchange's issue.

By Rafael Nu?o ·
Are you a Killer? Try this. Exchange 5.5 SP2, NT 4.0 SP5, IMC conected to other server on other domain with Proxy 2.0 binded to the port 25. Used only for outbound mail with outlook 98. Anyone inside can send mail to anyone at anydomain (anyone@anydomain.com) successfully... but not for one specific Domain: specificdom.com, IMC reports "Host unreachable", SMTP says "499 Host unreachable", NSlookup can find the MX records for that domain and all the SMTP host there (Exchange servers I guess) respond to the ping command. No blockings at proxy and the smtp (client) outbound filter is enabled. Are you ready?

Win the battle!

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Only for Smart Minds - Exchange's issue.

by yorkster In reply to Only for Smart Minds - Ex ...

Can you telnet to the site ? try a telnet session to the SMTP port on the site your trying to reach. If you get connected try sending mail from the telnet session.

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Only for Smart Minds - Exchange's issue.

by Rafael Nu?o In reply to Only for Smart Minds - Ex ...

Sorry. It was a DNS bad configuration with my reverse lookup address. I was at a non-authoritative ISP for my in-addr.arpa record. My ISP tried to fix it with and alias... until I found this wrong entry.

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Only for Smart Minds - Exchange's issue.

by mwb In reply to Only for Smart Minds - Ex ...

Is YOUR dns reverse resolution set correctly? Wouldn't it be funny if they were blocking you because you fail what is basically a SPAM test. Worth a shot.

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Only for Smart Minds - Exchange's issue.

by Rafael Nu?o In reply to Only for Smart Minds - Ex ...

Right! It was a DNS bad configuration with my reverse lookup address. I was at a non-authoritative ISP for my in-addr.arpa record. My ISP tried to fix it with and alias... until I found this wrong entry.

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Only for Smart Minds - Exchange's issue.

by dmiles In reply to Only for Smart Minds - Ex ...

This problem can occur with the following configurations:You are logged on to an ISP and attempt to send email through another ISP's gateway
This problem is not caused by Outlook.Contact your ISP for assistance
Related KB article Q214402

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Only for Smart Minds - Exchange's issue.

by Rafael Nu?o In reply to Only for Smart Minds - Ex ...

Right! It was a DNS bad configuration with my reverse lookup address. I was at a non-authoritative ISP for my in-addr.arpa record. My ISP tried to fix it with and alias... until I found this wrong entry.

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Only for Smart Minds - Exchange's issue.

by cabel In reply to Only for Smart Minds - Ex ...

I have same problem here - unfortunately without an answer. Try tracert to site. On the last hop, I don't get a response as if there is a block on our domain/subnet. Telnet also doesn't work for the same reasons. I've been working with someone at the site in question and he also has not found the problem.

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Only for Smart Minds - Exchange's issue.

by Rafael Nu?o In reply to Only for Smart Minds - Ex ...

Look out! It was a DNS bad configuration with my reverse lookup address. I was at a non-authoritative ISP for my in-addr.arpa record. My ISP tried to fix it with and alias... until I found this wrong entry.

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Only for Smart Minds - Exchange's issue.

by agarfein In reply to Only for Smart Minds - Ex ...

I'm aware that this is only happening to one site in particular, but for testing purposes try disabling access control on your proxy server and see if you can connect.

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Only for Smart Minds - Exchange's issue.

by Rafael Nu?o In reply to Only for Smart Minds - Ex ...

Sorry. It was a DNS bad configuration with my reverse lookup address. I was at a non-authoritative ISP for my in-addr.arpa record. My ISP tried to fix it with and alias... until I found this wrong entry.

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