Yes, I confirm also printing broken after:

Setting up zimbra-mbox-webclient-war (1.0.0.1523095946-1.u14)

Don't know exactly what you are trying to do,

but you shoud consider this new on 8.8.8:

Zimbra Chat:
New history management: history is now stored in IM conversations instead of in emails within the Chats folder.

Here you can have a visual of this functional problem (i've seen this across various zimbra versions, this is just an example) no one is able to solve..

https://www.youtube.com/watch?v=QWWUChBuGbw

I've seen that kind of behaviour on a 8.6 - which was unpatched for a while,

Those connections come from external?

Do you have 8.7.11 Patch 1 installed?

Still happening on Release 8.8.8.GA.2009.UBUNTU14.64 UBUNTU14_64 NETWORK edition !

This is 1 year old now!!,

1 year with support "working" on this,

1 year the server can't be upgraded because of this!

Still happening on Release 8.8.7.GA.1964.UBUNTU14.64 UBUNTU14_64 NETWORK edition.

"BUT I HAD A LOT OF PROBLEMS injecting memcached and nginx into new 8.8.6. PRevious 8.0.9 did not have any of those, and when I upgraded, those two simply did not start." You should have upgraded to 8.6 first and install proxy + memcached correctly - some of your problems may be due to wha...

Do you have the hotfix/patch for 8.8.6 released recently? The blacklist problem is probably a compromised account on the system - just coincidence with the upgrade - or not.. In last resort If you can restore your system to the state of your old 8.0.9 you can probably move to another version of Zimb...

Still happening on Release 8.8.6.GA.1906.UBUNTU14.64 UBUNTU14_64 NETWORK edition

The solution is "don't upgrade"!! Seems 8.8 was an "in hurry" release - Zimbra was used to be somekind of a "stable" product - this is going away the door also - not only the support (being miserable and irresponsive)