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Version: 4.9

IMAP Identification Issues

Symptoms​

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

Issue​

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

Resolution​

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:
pgrep -c imap
  1. Increase the Max child setting in Cyrus according to the calculation above.