[Dovecot] error while connecting from squirrelmail

[Srinivas]

Hi all,
  I am new to dovecot and squirrelmail and I am trying to configure squirrelmail with dovecot as its imap server. When i disable "Secure Imap (TLS)" option (2-A-7) from squirrelmail configure menu, it's working fine. But when i try to enable tls support, squirrelmail is giving the following error:

Warning: fsockopen(): unable to connect to 192.xx.xx.xx:993 in
/usr/share/squirrelmail/functions/imap_general.php on line 445

ERROR
Error connecting to IMAP server: tls://192.xx.xx.xx.
111 : Connection refused
Go to the login page

The port numbers of the imap server are as follows:

imap_listen 143
pop3_listen 110

imaps_listen 993
pop3s_listen 995

Squirrelmail and the dovecot imap server are running on different machines, so it is essential to enable tls support. All the machines are running Debian Sarge.

Can anyone suggest a solution for the above problem ?
Thank you.
                  Srinivas

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