Imap connections: Difference between revisions
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Feb 6 11:18:28 weasel imapd: Maximum connection limit reached for ::ffff:10.0.0.66 | Feb 6 11:18:28 weasel imapd: Maximum connection limit reached for ::ffff:10.0.0.66 | ||
</pre> | </pre> | ||
This shows which clients are holding onto connections: | |||
<pre> | |||
root@weasel:/etc/init.d# netstat -n |grep :143 | sort -k +4 | |||
</pre> | |||
Count which ones are in the ESTABLISHED state: | |||
<pre> | |||
netstat -n |grep :143 | grep ESTAB | sort -k +4 | wc | |||
</pre> | |||
When my phone is connecting through the telco network instead of wifi, the connection looks like this: | |||
Verizon (myvzw.com) | |||
tcp6 0 242 216.99.216.99:143 70.199.228.147:11752 ESTABLISHED | |||
T-Mobile (tmodns.net) | |||
tcp6 0 0 216.99.216.99:143 208.54.32.249:64691 ESTABLISHED | |||
This shows the processes: | |||
<pre> | |||
root@weasel:/etc/init.d# ps -eaf | grep imapd | wc | |||
39 397 3487 | |||
</pre> | |||
<h3>Why?</h3> | |||
I know we have a lot of devices laying around. But what changed? Did the clients change or did the server change? | |||
Revision as of 19:50, 6 February 2013
Running out of imapd connections
The problem looks like this from xymon:
yellow Wed Feb 6 11:02:18 2013 imap NOT ok Service imap on localhost is not OK : Unexpected service response Seconds: 0.000132
And clients see intermittent errors trying to connect.
And syslog shows this:
Feb 6 11:18:20 weasel imapd: 40 maximum active connections. Feb 6 11:18:20 weasel imapd: Maximum connection limit reached for ::ffff:10.0.0.66 Feb 6 11:18:23 weasel imapd: last message repeated 3 times Feb 6 11:18:28 weasel imapd: Maximum connection limit reached for ::ffff:10.0.0.66 Feb 6 11:18:28 weasel imapd: Maximum connection limit reached for ::ffff:10.0.0.66
This shows which clients are holding onto connections:
root@weasel:/etc/init.d# netstat -n |grep :143 | sort -k +4
Count which ones are in the ESTABLISHED state:
netstat -n |grep :143 | grep ESTAB | sort -k +4 | wc
When my phone is connecting through the telco network instead of wifi, the connection looks like this: Verizon (myvzw.com)
tcp6 0 242 216.99.216.99:143 70.199.228.147:11752 ESTABLISHED
T-Mobile (tmodns.net)
tcp6 0 0 216.99.216.99:143 208.54.32.249:64691 ESTABLISHED
This shows the processes:
root@weasel:/etc/init.d# ps -eaf | grep imapd | wc
39 397 3487
Why?
I know we have a lot of devices laying around. But what changed? Did the clients change or did the server change?