troubleshooting Question

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

Avatar of GWIC100
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 10.0.0.4 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 10.0.0.4 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...
ASKER CERTIFIED SOLUTION
DarthMod

Our community of experts have been thoroughly vetted for their expertise and industry experience.

Join our community to see this answer!
Unlock 1 Answer and 6 Comments.
Start Free Trial
Learn from the best

Network and collaborate with thousands of CTOs, CISOs, and IT Pros rooting for you and your success.

Andrew Hancock - VMware vExpert
See if this solution works for you by signing up for a 7 day free trial.
Unlock 1 Answer and 6 Comments.
Try for 7 days

”The time we save is the biggest benefit of E-E to our team. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange.

-Mike Kapnisakis, Warner Bros