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{{Tip box|You can see if you are running out of the number of available connections in your log file /var/log/imaps/current and look for messages like the log extract below where the ConcurrencyLimitPerIP was set to 20. A 21st connection was attempted and was denied.
{{Tip box|You can see if you are running out of the number of available connections in your log file /var/log/dovecot/current and look for messages like the log extract below where the ConcurrencyLimitPerIP was set to 20. A 21st connection was attempted and was denied.
@400000005396a2d215b40d9c imap-login: Info: Maximum number of connections from user+IP exceeded (mail_max_userip_connections=12): user=<stephane>, method=PLAIN, rip=90.84.144.xxx, lip=192.168.xx.15, TLS
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{{Tip box|Mobile devices have a tendency to frequently disconnect and connect from the network. When this disconnect happens, the sessions on the server are not always immediately cleaned up (they get cleaned up after a time out of some minutes). When the email client reconnects, they create new network connections and you get into the situation that these new connections get denied because of the concurrency limit. On the mobile device this may be noted as a "Unable to connect to server" message.
{{Tip box|Mobile devices have a tendency to frequently disconnect and connect from the network. When this disconnect happens, the sessions on the server are not always immediately cleaned up (they get cleaned up after a time out of some minutes). When the email client reconnects, they create new network connections and you get into the situation that these new connections get denied because of the concurrency limit. On the mobile device this may be noted as a "Unable to connect to server" message.
