[73306] in North American Network Operators' Group
Blocked port 25?
daemon@ATHENA.MIT.EDU (Byron L.Hicks)
Wed Aug 18 23:37:47 2004
To: nanog@merit.edu
From: Byron L.Hicks <bhicks@nmsu.edu>
Date: Wed, 18 Aug 2004 21:37:03 -0600
Errors-To: owner-nanog-outgoing@merit.edu
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In the last couple of days, I have received complaints from customers
not able to receive email from certain sites. From these sites, I
can't connect to our mail server, on other sites, I can. We have tried
sending email, and we have also tried telnet on port 25 to the server.
I can't seem to find a correlation. There is no firewall on our
network. We have an access list to filter port 25, but this server is
allowed. Our mail server is also our DNS server. From the sites that
I can't connect to our server on port 25, I can query the DNS server
using nslookup and get a response.
I tried tcptraceroute from one of the sites where I have a unix
account, but it is behind a firewall, and it dies after the first hop.
I'm stumped. Any suggestions.
Byron L. Hicks
Network Engineer
NMSU ICT
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