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How To Fix Error: Connection Drop By IMAP Server

If you are constantly receiving this error message, “Connection dropped by IMAP server.” when you are logged into your web mail, it is because you have maxed out the number of client connections allocated to your web mail server. It is really easy to solve the issue, and it’s by simply increasing the number of client connection.

 

Step 1 – Login into your web server via SSH.

Step 2 – Check your web mail server’s log file for drop error by executing the following codes:

#> cd /var/log/
#> cat maillog* | grep drop -i
Jan 27 00:55:56 ns72 dovecot: master: Warning: service(imap-login): process_limit (100) reached, client connections are being dropped
Jan 27 00:59:11 *** dovecot: master: Warning: service(imap-login): process_limit (100) reached, client connections are being dropped 
Jan 27 01:03:59 *** dovecot: master: Warning: service(imap-login): process_limit (100) reached, client connections are being dropped 
Jan 27 01:05:08 *** dovecot: master: Warning: service(imap-login): process_limit (100) reached, client connections are being dropped 
Jan 27 01:06:12 *** dovecot: master: Warning: service(imap-login): process_limit (100) reached, client connections are being dropped 
Jan 27 01:07:23 *** dovecot: master: Warning: service(imap-login): process_limit (100) reached, client connections are being dropped 
Jan 27 01:09:22 *** dovecot: master: Warning: service(imap-login): process_limit (100) reached, client connections are being dropped 
Jan 27 01:19:26 *** dovecot: master: Warning: service(imap-login): process_limit (100) reached, client connections are being dropped

 

Step 3 – Edit dovecot.conf file to increase your client connection limit.

#> vi /etc/dovecot.conf

 

Step 4 – Type “A” in vi mode to insert text. Increase the client_limit from 100 to 1000 or any number of your choice.

service imap-login { client_limit = 1000 process_min_avail = 16 user = dovecot }

 

Step 5 – Save and exit.

Step 6 – Restart dovecot.

#> /etc/init.d/dovecot restart

 

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