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We are using Kerio Connect version 7.4.3 on a CentOS server. We have have configured to make a backup to a NFS share. We had an issue with our NFS-server while the full-backup was performed. This causes our Kerio Connect srver go over his open file limit. In the warning log we received this:

Connection attempt to service HTTPS from IP address <ip-address> rejected: too many connections. Connection limit is 1000.

In the error log we can read:

MessageFolder.cpp: Cannot open message file /opt/kerio/mailserver/store/mail/ in mode rb: (24) Too many open files

After that we had messages like User ~user<_at_> journal corruption detected - journal was removed. New profiles in email clients may have to be created (specially in Outlook 2011 and ActiveSync) in the warning log.

At this point we cannot acces our e-mailby webmail nor by Outlook or phone. We recovered the connections with restarting the Kerio service.

What happen when a NFS server becomes unreachable with Kerio Connect? Is it possible to change this way so that the Kerio Connect mailserver will be reachable?

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The Kerio Connect backup in itself does not know about NFS mounts. It just writes the backup files to wherever you have configured it to write. If an NFS mount disappears in the middle of a backup, the temporary work file (.part) suddenly disappears for the backup process. File systems are not supposed to go away, so the backup will wait for it to reappear forever.

To get around this, mount the NFS volume soft. I.e. use "soft" as a mount option on the mail server. This will make the backup process give up after a while, and you will get a failed backup instead of a hanging mail server. We use timeo=600,soft in our NFS mounts.

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Or just backup to a local drive and have a low priority job copy stuff wherever later.

That method also lets you make copies to multiple places and doesn't slowdown the backup because of network speed.

Tony Lawrence
Kerio Preferred Partner and Reseller
Certified for Connect, Control
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