Unable to Telnet to Exchange server on port 25

Posted on 2006-10-25
Medium Priority
Last Modified: 2008-02-01
Our Exchange 2003 server suddenly stopped receiving incomming mails. I cannot telnet to port 25, just get a flashing cursor, as soon as  I type anything it disconnects the telnet session. No Mcafee or Symantec virus checkers installed. Restarted server, issue still remains. No ports blocked, telnet internally and externally causes the same issue.

Question by:esscolab
LVL 16

Expert Comment

ID: 17805102
have you any AV installed ?
LVL 104

Accepted Solution

Sembee earned 750 total points
ID: 17805245
Is the SMTP Server service running?
Anything in the event viewer about services failing?


Expert Comment

ID: 17805572
Check your queues. You may be bombarded with processing spam and/or System Administrator messages.  How is the system resources being handled?  Any high CPU or RAM?

I have seen Symantec Antivirus Corporate Edition (the server antiv, not the Exchnage aware version) setup incorectly by having the SMTP option enabled, which blocked port.  You stated you didn't have antiv as the issue, but just making sure you weren't just talking about Exchange aware antiv only.

Expert Comment

ID: 17808954
Did you change the SMTP port. Check the properties of the default smtp Virtual Server.
Are you running any other SMTP serices? Are you running Surfcontrol Surfmail Spam filtering softare on your Exchange Server? Or are you running anyother Anti-spam filtering software like Antigen, IhateSpam, GFI Essentials.


Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

What is the biggest problem in managing an exchange environment today? It is the lack of backups, disaster recovery (DR) plan, testing of the DR plan or believing that it won’t happen to us.
Let us take a look at the scenario, you have a database that is corrupt and you run the ESEUTIL command only to find you are unable to repair it. How do you now get the data back?
how to add IIS SMTP to handle application/Scanner relays into office 365.
This video tutorial shows you the steps to go through to set up what I believe to be the best email app on the android platform to read Exchange mail.  Get the app on your phone: The first step is to make sure you have the Samsung Email app on your …
Suggested Courses

624 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question