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Could not open connection to the host, on port 25: connect failed

Posted on June 11, 2008 by gchandra

Digg me

Error Msg : Could not open connection to the host, on port 25: connect failed

What does this mean ?

You web application is not able to reach the SMTP Host using Port 25.

Possible Reasons…

1. If Web Server itself relays the email check for SMTP service under Services and as well as under IIS.

2. If Email Relay server is different make sure your web server is able to reach it (by pinging).

2a. Verify with admin, whether Port 25 is open.

3. Check Firewall (software or firewall server) on your server (to allow outgoing connection)

4. Check firewall (software or firewall server) on Relay server (to accept incoming connection from your server).

5. Check the Virus Scanner on your server. Some scanners like MCAFee / Norton disables mass mailing by default.

If you have come across any other scenario please add it in comments.

5 thoughts on “Could not open connection to the host, on port 25: connect failed”

Genadi on August 1, 2008 at 2:28 am said:

Test

Reply ↓
CK on October 24, 2009 at 9:10 pm said:

All above 5 items are cleared, but still get below message

Could not open connection to the host, on por
t 25: Connect failed

Any ideas?

Thanks

CK

Reply ↓
ahmed on August 25, 2010 at 3:13 am said:

could you please explain number one If Web Server itself relays the email check for SMTP service under Services and as well as under IIS.

Reply ↓
gchandra on August 25, 2010 at 6:29 am said:

Ahmed check this link

http://support.microsoft.com/kb/230235

Reply ↓
ahmed on August 27, 2010 at 8:27 am said:

thanks gchandra

Reply ↓

Script(s)

technology as-is

Could not open connection to the host, on port 25: connect failed

5 thoughts on “Could not open connection to the host, on port 25: connect failed”

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