dovecot imap ssl - not working connection to storage server failed

 ok i've got it. It was no firewall thing. Its an automatic installation of the kolab-premium-mail extension, which i dont want, but its automatic activated - strange.

this article is the solution:
Unable to log in to webmail with enabled Plesk Premium Email: Could not connect to localhost:143: Connection refused

to check this, the netstat command give the right information

Code:

netstat -plutn | grep 143
tcp        0      0 127.0.0.1:9143          0.0.0.0:*               LISTEN      6263/dovecot

Code:

netstat -plutn | grep 993
tcp        0      0 127.0.0.1:9993          0.0.0.0:*               LISTEN      6263/dovecot

removing the "Plesk Premium Email, powered by Kolab" extension via panel, dovecot works on the normal ports:

Code:

netstat -plutn | grep 993
tcp        0      0 0.0.0.0:993             0.0.0.0:*               LISTEN      14523/dovecot