Question

SMTP port 99 works but not 25

Asked by: garryshape

We have exchange smtp server configured under ports to use 25 and 99. When I confgure my Outlook client, I set the smtp server port to use 99 and the test connection works and everything, but when I choose 25 outlook gives me failed to connect error.

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Asked On
2008-08-29 at 02:36:15ID23688288
Tags

Microsoft

,

Exchange

,

2003

Topics

Exchange Email Server

,

Windows XP Operating System

Participating Experts
5
Points
500
Comments
9

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Answers

 

by: slam69Posted on 2008-08-29 at 02:37:59ID: 22343657

Is the port open

 

by: slam69Posted on 2008-08-29 at 02:40:19ID: 22343667

if it is then could be a rule on the firewall/router preventing outbound traffic on that port

take alook at

http://www.experts-exchange.com/Networking/Protocols/Application_Protocols/Email/SMTP/Q_23601705.html

same issue

 

by: BertlingPosted on 2008-08-29 at 02:41:22ID: 22343670

try to telnet on port 25 also to help you narrow down things but as said above it looks like the firewall is blocking port 25 traffic

 

by: chris-burnsPosted on 2008-08-29 at 02:57:00ID: 22343742

Some ISP's prevent home users from connecting to servers other than their own on port 25.

Orange UK is one that sticks in my mind. Easiest way to check is to run cmd and type

telnet yourserverip 25 (ie telnet 122.211.0.1 25).

If the ISP has blocked it you will get an error message such as "This port is blocked to prevent spam, please change your smtp address to smtp.orange.co.uk"

Obviously this does not apply if you are trying to connect on your internal LAN.

Hope that helps

 

by: jjdurrantPosted on 2008-08-29 at 05:57:07ID: 22344849

 

by: pagroupPosted on 2008-08-29 at 09:23:21ID: 22347011

Some virus scanning and firewall programs block outbound connections to port 25. You might try if you can connect using telnet to port 25 on other machines (Maybe your ISP has a SMTP server).

 

by: garryshapePosted on 2008-08-29 at 11:25:26ID: 22347991

I just discovered it is ATT blocking the port 25 which is why 99 is working apparently they block 25 but you can unblock it but I guess there's no need to

 

by: garryshapePosted on 2008-08-29 at 11:26:46ID: 31491454

Thanks, confirmed this with ATT.

 

by: chris-burnsPosted on 2008-08-29 at 12:45:59ID: 22348675

Glad to be of help.

20120131-EE-VQP-002

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