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Old 07-16-2014, 08:13 PM   #1
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Registered: Jul 2014
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Connecting to SMTP server on Port 25

Hey all,

I have a problem with connecting to my smtp-server.

On my current system (Linux Mint 17) I cannot connect to my smtp server on port 25. But when I am using one of my older systems where Ubuntu 10.04 is running, everything works fine.
When I'm using a VPN connection to another network, it also works on Linux Mint.

So it isn't an issue with my thunderbird, but rather a network problem (?).

Do you know how can I test if there is an issue with opened/closed ports? Are there any differences in the network preferences between the old ubuntu and the new mint version?

Thanks in advance,
Old 07-17-2014, 12:24 AM   #2
Registered: May 2009
Location: Fort Langley BC
Distribution: Kubuntu,Free BSD,OSX,Windows
Posts: 342

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Do you know how can I test if there is an issue with opened/closed ports?
Telnet from the command line is a good tool.
Google "linux telnet smtp"

The errors generated will be somewhat informative.

Good Luck !
Old 07-17-2014, 03:42 AM   #3
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Registered: Jul 2014
Posts: 2

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Thanks for your kind reply!

On Linux Mint, Telnet fails to connect to the smtp server - it times out.
telnet <ServerName> 25
Trying <ServerIP>...
telnet: Unable to connect to remote host: Connection timed out
When I'm using the VPN connection, it works. (As I said, sending Emails also works via VPN):
telnet <ServerName> 25
Trying <ServerIP>...
Connected to <ServerName>
Escape character is '^]'.
220 **************************
I guess it seems, that my network configurations blocks the connection to the smtp?!

Last edited by juergend; 07-17-2014 at 03:44 AM.


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