When updating compute manager settings (i.e. updating thumbprint after a vCenter certificate change, updating credentials) or adding a compute manager the following errors prevents the connection.
FQDNs are not configured for nodes IPs [X.X.X.X]. (Error code: 90335)
Reverse DNS entries are not configured on the configured DNS server
NSX requires forward and reverse DNS entries for any of the following scenarios:
Starting with NSX 4.1 and later versions, in a dual stack environment (that is, both IPv4 and IPv6 have been configured).
Use cases where "publish_fqdns": true.
NSX Manager that uses CA-signed certificates.
NSX Manager with Multisite deployments. (It is optional for all other deployment types.) See Multisite Deployment of NSX in the NSX Administration Guide.