troubleshooting Question

telnet to port 25 on mail server hangs for over 1 minute before responding with 220

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GWIC100Flag for United States of America asked on
Linux Networking
6 Comments1 Solution511 ViewsLast Modified:
My mail server was working great two days ago. something changed over night. Now when I telnet 25 the system hangs for over a minute before it gives me a 220 message.

I suspected DNS was the issue and that's why I used the IP address. If I telnet to localhost 25 on the mail server, it is very quick, but if I telnet 25  or telnet mailhostname 25 it hangs for just over 1 minute before giving me a 220 message.

any ideas?

- I can ping mailhostname and get quick responce, I'm thinking it's a sendmail configuration issue...

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