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Port 25 blocked and can't figure out where

Posted on 2013-05-29
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Last Modified: 2013-08-12
I called my ISP and they said it is not blocked on commercial servers.

I have a linksys router by cisco and its not blocking port 25.

I disabled windows firewall and trend temporarily and it appears port 25 is still not accessible.

Any ideas?
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Question by:cnl83
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Expert Comment

by:Coffinated
ID: 39205369
Do you have any service running on port 25? try telnetting to it form the outside
telnet hostname 25

If you do have a service enabled on it, make sure NAT is properly configured, all routes, IP, subnets are also properly set up.
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by:Chris_Ryan81
ID: 39205372
Where is it being blocked?  Inbound to a server, outbound to internet, between two servers...

How do you know it is not being blocked by the Linksys?  (it isn't likely blocked by default)
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by:Chris_Ryan81
ID: 39205387
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Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

 

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by:cnl83
ID: 39205404
I can't telnet port 25 from inside the network. I just tried from a pc on the network.
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by:Chris_Ryan81
ID: 39205422
What is your destination, are you trying to reach an external SMTP server, such as with an ISP?
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by:Coffinated
ID: 39205424
Run' netstat -an' on the server, check if port 25 is open.
http://social.technet.microsoft.com/Forums/en-US/winserverPN/thread/9d661ff2-c153-400e-a6b2-dbf90b213426/

Most likely it is not running, that's why you can't reach it.
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Author Comment

by:cnl83
ID: 39205438
I ran netstat -an it I didn't see anything about port 25.
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Author Comment

by:cnl83
ID: 39205440
trying to telnet server on local network.
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by:Coffinated
ID: 39205463
Check the services, make sure it is running on port 25. If nothing is running on it, you will not be able to connect to it.
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by:cnl83
ID: 39205485
How do I check the services to see if they are running on 25?
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Author Comment

by:cnl83
ID: 39205512
Services are actice
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by:Alan Hardisty
ID: 39205681
If you type the following from a command prompt:

netstat -anbp tcp | findstr :25

Do you see anything as the result?

Also test port 25 on www.canyouseeme.org and see if you get SUCCESS as the result.

What should be listening on port 25 on your server?  You don't mention Exchange in the topics.

Alan
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by:cnl83
ID: 39205743
That all failed.

Im using smartermail server from smartertools.com
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Alan Hardisty earned 500 total points
ID: 39205753
Okay - is it running and configured on port 25 as it sounds like it isn't.
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by:cnl83
ID: 39205768
Im going back and forth with smartermail techs to ensure it is.
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by:Alan Hardisty
ID: 39205777
Okay - shout once you have confirmed it is (should be) and then it still isn't working.

The netstat command I posted should help determine if your server is listening and then the canyouseeme.org site should verify if it works externally.

Here if you still get nowhere.

Alan
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Expert Comment

by:Coffinated
ID: 39205806
smartermail techs should be able to pinpoint the problem and get you up and running.

As stated already you can do a netstat command or telnet 127.0.0.1 25 (on the server) or telnet server 25 from another computer to test it.

If they tell you it is running test it locally on the server first, then from LAN and WAN.
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Author Comment

by:cnl83
ID: 39290984
It was a smartmail configuration issue. There was nothing listening on port 25 in the first place.
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by:Alan Hardisty
ID: 39291010
Good - so are you getting emails now happily?

Alan
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Author Comment

by:cnl83
ID: 39331026
yes
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by:Alan Hardisty
ID: 39335574
Excellent.

Don't forget to close the question down then select the comment or comments that helped you solve the problem, or you can accept your own comment and optionally award some/all points to other comments if they were useful.

Alan
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