After Centos 8 nodes were removed from cluster and only Centos 9 nodes remained the nodes remaining are experiencing issues.
Symptoms:
Virtual Appliance 14.5, 14.5.1
On vApp deployment screen (Hamburger menu - Setup - External database - Edit) make sure to click "Test All Connections" (you will need to retype passwords)
and then Apply at the bottom after test is complete to make sure db information are applied correctly to Centos 9 nodes of vApp.
Follow the prompts to restart.