Just in case anyone else hits this issue:
Symptoms:
* One HA Member upgraded, patched, MVC enabled and policy pushed to it.
* After patching FULLSYNC PNOTE would not clear, Upgraded member in DOWN State.
* After multiple checks and process restarts cphaprob syncstat showed "Sync Status: Off - SIC failure"
* SK search leads to: https://support.checkpoint.com/results/sk/sk145372
* MTU validated and not the issue.
So the hopefully the next google search for this issue by the next person picks this up:
The upgrading engineer had reset SIC on the Upgraded member but then not pushed policy to the un-upgraded member breaking trust between the HA peers.
A quick push to the other cluster member and issue resolved.
https://support.checkpoint.com/results/sk/sk125152
"This cluster member was not able to complete Full Sync because the SIC connections with a peer cluster member failed"
CCSME, CCTE, CCME, CCVS
