I've had the same configuration for years. At some point, one of the secondary's greyed out and will not recover.
What I've Tried:
- Uninstall/ Reinstall latest on all 3 (Primary and both secondary)
- Added Secondary by name, then IP address
- Restarted all units
- Turn off Firewall on Secondary
What other options are there?
Setup
Version 3.6 Build 00105.kvm
Primary: Windows Server 2019 Standard
Secondary (Working): Windows Server 2016 Datacenter
Secondary (Failed): Windows Server 2019 Standard