Proble accessing zcs upstream server - Exceeded the max requests limit.

[panos.augerinos]

Hi guys .
On my environment I have a multi server installation, using zimbra 8.0.4 64bit open source edition and I have a very strange situation.

Some users complained that while they was trying to log in, they saw the "Problem accessing ZCS upstream server. Cannot connect to the ZCS

upstream server. Connection is refused." message.
The same time on the /opt/zimbra/log/mailbox.log file of my back end mailstore server there are messages like the following:
https://19.29.39.134:443/service/soap/GetMiniCalRequest] [ip=19.29.39.112;ua=Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.57 Safari/537.36;] misc - Exceeded the max requests limit. Suspending org.eclipse.jetty.server.AsyncContinuation@2145v20f@REDISPATCHED,resumed,expired


Do you have any ideas on how to solve the problem?
Thanks in advance,

Panos

[panos.augerinos]

Hi,
Any update? Anyone?
Regards,

Panos

[2548jotun]

This also happens to our multi-server install, zimbra 8.0.5.

Requests made by our two zimbra proxy machine receive an http 502 error and mailbox.log show:

2013-12-12 10:26:15,586 WARN [qtp571606922-276216:http://127.0.0.1:80/service/soap/GetInfoRequest] [oip=$zimbra_proxy_ip;ua=zclient 8.0.5_GA_5839;] misc - Exceeded the max requests limit. Suspending org.eclipse.jetty.server.AsyncContinuation@38b8153b@REDISPATCHED,resumed,expired

we have already tuned our install following the large installation guidelines:

zmprov ms mail02 zimbraHttpNumThreads 700

zmprov mcf zimbraHttpDosFilterMaxRequestsPerSec 100

but it doesn't solve the problem.

The only way to mitigate the situation is to restart mailboxd, but after a while (it seems that depends on the average load of the mailbox server) it happens again.

[leoyip]

try to modify the concurrent http request

zmlocalconfig -e servlet_max_concurrent_http_requests_per_account=20