LinuxQuestions.org

LinuxQuestions.org (/questions/)
-   Linux - Newbie (https://www.linuxquestions.org/questions/linux-newbie-8/)
-   -   Connecting to SMTP server on Port 25 (https://www.linuxquestions.org/questions/linux-newbie-8/connecting-to-smtp-server-on-port-25-a-4175511329/)

juergend 07-16-2014 07:13 PM

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,
Jürgen

ceyx 07-16-2014 11:24 PM

Quote:

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 !

juergend 07-17-2014 02:42 AM

Thanks for your kind reply!

On Linux Mint, Telnet fails to connect to the smtp server - it times out.
Quote:

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):
Quote:

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?!


All times are GMT -5. The time now is 09:35 PM.