Folders are missing in Outlook after mailbox synchronization: Maximum number of connections from user+IP exceeded

Created:

2016-12-21 13:04:13 UTC

Modified:

2017-08-08 13:24:26 UTC

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Folders are missing in Outlook after mailbox synchronization: Maximum number of connections from user+IP exceeded

Applicable to:

  • Plesk 12.5 for Linux

Symptoms

  • Some folders are missing in Outlook after mailbox synchronization.
  • mail_max_userip_connections parameter in the Dovecot configuration is set to 10:
    # dovecot -a | grep mail_max_userip_connections
    mail_max_userip_connections = 10
  • Errors in /var/log/maillog :
    /var/log/maillog.processed:Dec 21 09:51:18 example dovecot: imap-login: Maximum number of connections from user+IP exceeded (mail_max_userip_connections=10): user=<user@example.tld>, method=PLAIN, rip=203.0.113.2, lip=203.0.113.1, TLS, session=<NfqTTyFE4QAqPdEQ>

Cause

Maximum number of connections for a user has been exceeded.

Resolution

Increase the maximum number of connections to avoid synchronization errros:

Tools & Settings > Mail Server Settings > Maximum number of connections for a user per IP address > increase the value and click OK .

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