Glen Vickers wrote:
Hello all,
I'm having an issue I have yet to figure out. About a week or so ago
my server stopped accepting incoming connections to send mail. I
checked my router/firewall/port forwarding settings and all was
correct. So I went inside our network (origionally the client was
outside) and attempted to connect/send mail. Same error from client,
unable to connect to mail server. So I attempted to telnet to both
the external IP and internal IP addresses. Connection refused (using
putty).
I checked the logs after that and don't see any reference to any IP
address attempting to connect to port 25. I checked to see if IP
tables had somehow been enabled on the machine. Nothing. I then
checked for SELinux and ran nmap localhost and nmap /Domain/ as well
as nmap /hostname/. It says port 25 is open and taking requests yet I
get connection refused at any location.
To make things interesting, I'm able to email to any address that
server holds. Just can't reply/send out from any address the server
holds. Any thoughts where I could look? The logs don't even show an
attempted connection.
Try telnetting via a command line, and make sure the HELO is what you're
expecting. If you're on a standard ISP (Comcast, etc.) then they may
have put a mail proxy in place without telling you, or some other router
using the "fixup" protocols.
If you post an IP/address we can test from outside. If you send me your
IP off-list I can check it here and run it through DNS-Stuff as well and
see if it flags anywhere.
