after applying Patch 33 (ZCS 8.8.15) we are receiving occasional complains that Zimbra servers are reporting "Network errors". The mailbox.log shows "com.zimbra.common.service.ServiceException: error while proxying request to target server: Service Unavailable" and the line directly above says:
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2022-09-19 16:21:48,620 INFO [qtp891095110-142194://localhost:8080/service/soap/BatchRequest]  misc - Access from IP [2001:aaa:bbbb:5:0:0:0:123] suspended, for repeated failed login.
with 2001:aaa:bbbb:5:0:0:0:123 being the servers IPv6 address. We explicitly configured 2001:aaa:bbbb:5:0:0:0:123 as well as 2001:aaa:bbbb:5::123 (just in case...) as zimbraHttpThrottleSafeIPs which should prevent any kind of DoSFilter Throttling. But this seems to have no effect... I am very sure that we did not have these kind of problems with P31.1 so I assume this was introduced with P32 or P33 (we never ran our servers on P32 - so I am not sure when this problem occurred). Can anyone confirm this behavior?