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Inbound authentication failed with error LogonDenied for Receive connector Default SERVERNAME. The authentication mechanism is Login

Hi all,
First I'll start by saying I'm an Exchange novice, so I'm a bit green when it comes to exchange in general.

Looking through the error and event logs, I noticed a bunch of the errors in the attached file.

Is this something to be concerned with? I am not familiar with the IP address listed, concerned someone is trying to hack in? or perhaps nothing to concerned about?

I also have seen the same error message with a different IP - 196.204.141.122

Thanks in advance
ERRORLOG.txt

SOLUTION

Schuyler Dorsey

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ChiIT

ASKER

Thanks for responding, so is this typical when you see when you have your own exchange? We do have a local spam filter running and a Dell Sonicwall firewall.

I am familiar with appriver and barracudas services and was considering them. You mention someone trying to bruteforce, is this related to spam do you think? Or someone trying to hack in? Also since this is via smtp, am I right I saying they are using smtp to try and I that?

Big Apologies for all the questions...

ASKER CERTIFIED SOLUTION

Simon Butler (Sembee)