I just learned that this is not the right way to fix the problem. Rather, what needs to be fixed is the cause of the name resolution not working both ways, DNS and rDNS.
In my case, there was a missing PTR entry for the PDN (=DC) in the corresponding reverse lookup zone. This can be added in the UMC GUI under Domain–>DNS or on the command line as described here
Upgrade working version 4.4 to 5 - DNS zones found no host record for nameserver