We are having an interesting problem with our Cisco 2600. I decided to switch to a new web/mail server and I put it on the DMZ (Ethernet interface) of the 2600. I set up the box and everything went fine until I went live with the box. I could send mail, view web pages, run webmin on the web server, resolve DNS queries, but it wasn't receiving E-mail. My Maillog was filled with the following error messages:
Jul 8 10:26:57 cobalt sendmail[23556]: g68EQvL23556: Authentication- Warning: cobalt.dawson.com: mail3077.flowgo.com [12.129.205.77] didn't use HELO protocol
Jul 8 10:26:57 cobalt sendmail[23556]: g68EQvL23556: collect: premature EOM: Connection reset by mail3077.flowgo.com
Jul 8 10:26:57 cobalt sendmail[23556]: g68EQvL23556: SYSERR(root): collect: I/O error on connection from mail3077.flowgo.com, from= <updates@flowgo.com>: Connection reset by mail3077.flowgo.com
I would receive a different set of these messages for each piece of mail coming in. I figured that it was how I set up the new box so I grabbed the old server and set it up in the DMZ. It too wouldn't receive e-mail or allow e-mail connections to it. I checked the logs and sure enough it
was receiving the same error messages.
I then changed the config of the router to allow all traffic to the appropriate address. That also did not work. I then changed the DNS to point back to the old IP and moved the old web server back to the DSL line and everything has been working since.
I searched Usenet and the Web. I tried all of the solutions that I found there including those in Sendmails FAQ, but none worked. I checked the MTU size and they are both set to 1500. Could this be caused by the
router interface being 10 mbit and the server interface being 100mbit?
--
William B. Grossman
Jul 8 10:26:57 cobalt sendmail[23556]: g68EQvL23556: Authentication- Warning: cobalt.dawson.com: mail3077.flowgo.com [12.129.205.77] didn't use HELO protocol
Jul 8 10:26:57 cobalt sendmail[23556]: g68EQvL23556: collect: premature EOM: Connection reset by mail3077.flowgo.com
Jul 8 10:26:57 cobalt sendmail[23556]: g68EQvL23556: SYSERR(root): collect: I/O error on connection from mail3077.flowgo.com, from= <updates@flowgo.com>: Connection reset by mail3077.flowgo.com
I would receive a different set of these messages for each piece of mail coming in. I figured that it was how I set up the new box so I grabbed the old server and set it up in the DMZ. It too wouldn't receive e-mail or allow e-mail connections to it. I checked the logs and sure enough it
was receiving the same error messages.
I then changed the config of the router to allow all traffic to the appropriate address. That also did not work. I then changed the DNS to point back to the old IP and moved the old web server back to the DSL line and everything has been working since.
I searched Usenet and the Web. I tried all of the solutions that I found there including those in Sendmails FAQ, but none worked. I checked the MTU size and they are both set to 1500. Could this be caused by the
router interface being 10 mbit and the server interface being 100mbit?
--
William B. Grossman