Exceeded the max requests limit

[panos.augerinos]

Hi,

I have a multi server installation, using zimbra 8.0.4 64bit open source edition with zextras and some users complained that some times they
have the following message while the are trying to login : "Problem accessing ZCS upstream server. Cannot connect to the ZCS upstream server.
Connection is refused."

At the same time on the /opt/zimbra/log/mailbox.log file of my back end mailstore server I have messages like the following:

https://19.29.39.134:443/service/soa...iniCalRequest] [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@2145v20 f@REDISPATCHED,resumed,expired

I'm not sure if this is a zextras issue.
I would appreciate it if you give my some help to understand the source of the issue.

Thanks in advance,
Panos

[Cine]

Hello panos.augerinos!

This issue is not directly related to ZeXtras Suite, but to the number of concurrent connections opened by the client: raising the maximum number of concurrent client connections should solve it.

In order to do so, run the following command as the 'zimbra' user and restart the mailboxd service afterwards:

zmlocalconfig -e servlet_max_concurrent_http_requests_per_account=20

Reaching the limit of concurrent connections per client can be a symptom of a wider issue, which can be caused by:
- Insufficient resources (CPU, ram, I/O)
- Database issues
- Networking issues

Having additional informations about your infrastructure could give us an idea, while should the issue appear again please run the following command and email the resulting logfile to community@zextras.com, we might be able to help you identifying the cause:

/opt/zimbra/libexec/zmdiaglog -ajz

Have a nice day,
Cine

[panos.augerinos]

Hi Cine,

Thanks for the update.

We are going to change the servlet_max_concurrent_http_requests_per_account value on our mailstore servers.

Regards,
Panos.

[jotun]

This issue is not directly related to ZeXtras Suite, but to the number of concurrent connections opened by the client: raising the maximum number of concurrent client connections should solve it.

Hi Cine, we have had the same problem on our installation (~ 3000 users splitted on 4 mailstores, 2 proxy servers), solved temporarily by disabling the chat module.
We'd like to re-enable it, should we also change the servlet_max_concurrent_http_requests_per_account? Have you ever had such reportings?
We've found (simply by reading in realtime the mailbox.log) that the chat zimlet does _a lot_ of request to the mailboxes.