Patch 32 installed without errors on all hosts, and Zimbra worked OK immediately afterwards. But this morning we started seeing a large number of "NO_SUCH_BLOB" errors. Similarly, the local monitoring agents on these two mailstores were complaining they couldn't talk to the mothership.
Sure enough, Zimbra's Unbound had stopped resolving queries.
I did as the zimbra user:
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zmdnscachectl stop
zmprov ms `zmhostname` -zimbraServiceEnabled dnscache
I opened a Support Case as well for this.
zmcontrol -v output:
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Release 8.8.15.GA.4177.UBUNTU20.64 UBUNTU20_64 NETWORK edition, Patch 8.8.15_P32.
Mark