Failed connection to the IMAP server

Hello,

When trying to log in via Webmail (using RoundCube), I get the error: "Failed connection to the IMAP server"

When executing a command:telnet 127.0.0.1 143

I see the following:Trying 127.0.0.1...telnet: connect to address 127.0.0.1: Connection refusedtelnet: Unable to connect to remote host: Connection refused

Tried to run IMAP:service courier-imap start

The result is the same.

Team:ps ax | grep courier

Outputs: 6546 ? S 0:00 /usr/libexec/courier-authlib/authdaemond 6565 ? S 0:00 /usr/libexec/courier-authlib/authdaemond 6842 pts/1 S+ 0:00 grep courier

I'm not very good at server administration, I tried to Google a solution to the problem, but I didn't find a solution.

Who can tell you what the problem may be, in which direction to dig ?

How can I check the health of the IMAP server ?

Thanks.