Hello Rafael,
and welcome to Zextras Forum!
As I answered on the support portal, for who will have the same issue, often this error message is related to a low zimbraHttpDosFilterMaxRequestsPerSec.
The access.log and the mailboxd.out should report some 429 errors:
Code:
"https://172.17.0.2:7071/zimbraAdmin/" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36" 1
192.168.1.100 - - [11/Jan/2018:09:53:04 +0000] "POST https://172.17.0.2:7071/service/admin/soap/zextras HTTP/1.1" 429 274 "https://172.17.0.2:7071/zimbraAdmin/" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36" 0
and
In this case, we suggest to increment zimbraHttpDosFilterMaxRequestsPerSec
Code:
zmprov mcf zimbraHttpDosFilterMaxRequestsPerSec 200
zmmailboxdctl restart
Have a nice day,
Luca
The Zextras Team
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