Saturday, April 3, 2010

SMTP Errors

The other day I was installing Varonis DatAdvantage for a customer and during the installation process received the following error, "The message could not be sent to the SMTP server. The transport error code was 0x800ccc15."

The first thing I wanted to check was that I had connectivity to the Exchange Server. So I used telnet to connect to port 25. That worked fine, so there was not a firewall in place blocking the connection. The Exchange server was set up to accept relays so that was not the problem.

After some investigation it turned out that McAfee VirusScan Enterprise 8.7.0 was the culprit.

Access Protection was enabled, so I reviewed the settings.

The issue was the rule to "Prevent mass mailing worms from sending mail" was blocking all traffic from the Varonis server. It was stopping all programs except those that are explicitly allowed from using SMTP to send messages.

Back to the McAfee server to add the programs in question and we are back in business.