I have two Cisco Identity Services Engine (ISE) standalone nodes, Node1 and Node2. My goal is to sync the configuration from Node1 to Node2, but I want to avoid any IP address conflicts in my network. Both nodes have different management IP addresses...
I had the same problem on ISE 3.3 Patch 4 and tested everything. Finally, I found that it was a hardware issue. When I moved ISE to another host server with the same configuration (CPU, RAM, etc.), the problem was resolved.
You should simply remove that certificate as recommended by Cisco supportISE > Administration > System > Certificates > Trusted Certificateshttps://www.cisco.com/c/en/us/support/docs/field-notices/742/fn74259.html
All non-backbone area's in OSPF need to be connected to the backbone area (database exchange). as others explained you can use virtual link considering it's a temporary solotion (DNA flag on LSA, dependency on transit area, ......)
