Zimbra IMAP available

[magz]

Dear community,

I periodically get notice in my Zimbra section about unavailable IMAP service like this:

External IMAP Check
	
	OK 	05-21-2010 15:18:00 	0d 1h 23m 35s 	1/4 	IMAP OK - 0.101 second response time on port 143 [* OK mydomain Zimbra IMAP4rev1 service ready]

So, I trying to connect

telnet myserver 143

and I get the response after 20-25 sec.

BTW the same situation with internal IMAP check and it happens not more than 2-3 times per week. It goes on about 20-30 minutes. And I didn't see any alerting in my mailbox.log.

Any suggestion?

Thank in advance.

[jummo]

Maybe your Zimbra system reaches the maximum threads for imap (default to 200). You can run zmstat and look at the graphs.

If so, you can set the max threads for imap with the following command

zmprov ms zm01.ohb-system.de zimbraImapNumThreads <thread num>

After that, restart the mailboxd.