Getting smtp issue
I am getting smtp issue with our zimbra server.It will shows below message when i checked the log of zimbra.Can any one help me to solve the issue...
Sep 10 05:16:41 zimbra6 postfix/smtpd: warning: Connection concurrency limit exceeded: 51 from unknown[18.104.22.168] for service smtp
Sep 10 05:16:41 zimbra6 postfix/smtpd: disconnect from unknown[22.214.171.124]
May be due to above problem the load of server increases upto 15.
You could increase the number of connections a little
su - zimbra
zmprov mcf zimbraLmtpNumThreads "100"
zmmtactl stop ; zmmtactl start
Does this happen at random. With just that IP or several. Corrupt headers can cause an MTA to open up too many connections. Corrupt packets can cause this as well. I've been using ZCS on two production server (as well as two other mail servers) for a long time and never had to increase connection limits.
Reset your NIC as well.
Good points Bill ... As well as resetting your NIC try setting the speed and duplex if set to auto-neg.