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I actually also managed to fix this a few days ago. It was a stupid mistake which I didn't think about. The manuals etc make you aware of it: I made the webinterface of both OPNs only available on a specific interface, which is not the SYNC interface. After I enabled the webinterface on both the management network and SYNC network, it worked fine. Setting can be found under system > settings > administration > listen interfaces

Hope this helps

Sadly I don't have a fix but I have the same problem... Worked fine before and now "The backup firewall is not accessible or not configured." but the VIPs seem to be working fine