[Dovecot] Connection dropped by imap server Query: CAPABILITY

[Srinivas]

Hi all,
  I have installed squirrelmail-1.4.4 and dovecot 0.9.11 on a debian sarge machine. The tls/ssl support is disabled from both squirrelmail and dovecot imap server. When i try to login i get the following error message:

ERROR:
ERROR : Connection dropped by imap-server.
Query: CAPABILITY

If i give wrong password, it gives the message

Unknown user or password incorrect.
which is fine.

The file /var/log/mail.err, is appended with the following message:

Jul  5 18:40:20 server dovecot: chdir(/home/username) failed with uid 1240: Permission denied
Jul  5 18:40:20 server dovecot: child 20807 (imap) returned error 89

when i run the command: dovecot -c /etc/dovecot.conf
it gives the following error:

Fatal: listen(143) failed: Address already in use

Later i enabled tls in squirrelmail and dovecot.conf. 
i got the following error:

Warning: fgets(): SSL: fatal protocol error in /usr/share/squirrelmail/functions/imap_general.php on line 88
ERROR:
ERROR : Connection dropped by imap-server.
Query: CAPABILITY

Any suggestions? 
Thank you
                    Srinivas

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