Authentication Is Not Enabled and SMTP Error 421
Tags :Domino email SMTP error 421
A Domino server at a client was showing a SMTP Error 421: SMTP Service Not Available, closing the transmission channel. Here is our steps to troubleshoot and solution.
They also decided to have an intermediate spam filter and then some routing of port forwarding on their internal network. This offered many challenges with allowed hostname and addresses for connectivity. After getting past that we were still left with the above errors. We found an IBM technote that described the issue and errors but was hard to follow since it contradicted itself.
Read more on the error, steps to troubleshoot and the confusing technote on my Sys Admin Tips newsletter article here.
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On Tuesday, May 27th, 2014 by Chris Miller
