Symptoms

• Users are no longer able to log in at all
• 'Bad Gateway' errors when accessing the Web application
• Occasional connection issues

• ips logs return messages such as:

  Bloc de code
  net.bluemind.ips.vertx.ProxySession WARN - Closing connection from /192.168.0.0:33333 as it failed to authenticate for 30sec.

Issue

When the maximum number of IMAP processes has been reached, users get log in login errors.

bm-ips may also no longer accept any connections.

Solution

You need to increase the maximum number of IMAP processes.
In general, you need to allow for 1.5 the number of users for a mixed webmail/thick client use. On installations where many users use thick clients, you need to allow for approximately 3 times the number of users.

1. Count the number of processes used currently:

   Bloc de code
   pgrep -c imap

2. Go to the administration console > System configuration Configuration > Mail tab and increase the maxchild max child value of in the Cyrus section (see calculation above):
   
   NB : la valeur par défaut du champ Note: the "Max child" est de 200 lorsque celui-ci est laissé videdefault value is 200 (added when the field is left empty).