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[ISSForum] Blackice Server: TCP_Probe_SMTP normal on mail server?

from [Cycle Rider] Network Security [Permanent Link]
Subject: [ISSForum] Blackice Server: TCP_Probe_SMTP normal on mail server?
Date: Fri, 3 Sep 2004 12:56:00 -0700 (PDT) 
I'm running blackice server (newest version) on a mail
server and using it to block dictionary attacks based
upon the smtp error message.

I am seeing hundreds of servers showing up in blackice
server as a TCP probe to port 25 on the mail server.

I need to know if it's normal for a mail server
talking to my mail server to trigger the probe
message?

Does anyone know how blackice determines that this is
a probe to port 25 rather than normal smtp activity?

Those of you running blackice on a mail server, did
you disable to automatic blocking of these probe
attempts?

Thanks for any help you can offer!


                
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