We have around 5000 users in our ZCS-7.1.3 server, installed on RHEL 5.5. Sometimes the concurrency of users hits more than thousand, the server is not giving any http response , when a user trying to hit it's url. After a restart of the application , it works for 2-3 days with out any issue(even the active sessions go beyond 1000).

can anyone help on this .

Zimbra Version: Release 7.1.3_GA_3346.RHEL5_64_20110928134520 RHEL5_64 FOSS edition, Patch 7.1.3_P1.

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