Zimbra Admin Console error

Zimbra Admin Console error

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Problem

Getting "HTTP response status 429" error on Admin Console.

Possible cause

• Due to the max requests reached to the configured value for HTTP DOS filter.
• Due to mis-configuration of DOS filter.

Solution

1. To override the issue, please modify below value, flush the cache and check the behavior once.

su - zimbra
zmprov mcf zimbraHttpDosFilterMaxRequestsPerSec 100
zmprov fc all

2. DOS filter should be configured properly is as follows [Single server]:

su - zimbra
zmprov ms `zmhostname` zimbraMailTrustedIP ""
zmprov ms `zmhostname` zimbraHttpThrottleSafeIPs ""
zmprov mcf +zimbraMailTrustedIP 127.0.0.1
zmprov mcf +zimbraMailTrustedIP SERVER_IP
zmprov mcf +zimbraHttpThrottleSafeIPs SERVER_NETWORK/CIDR    #
zmlocalconfig -e servlet_max_concurrent_http_requests_per_account=20
zmcontrol restart

Note : # Involve to Network Engineer to calculate exact CIDR value.

Submitted by: Krishna M. Bhosale