When we installed OpManager 12200 we had an issue with the DNS Reverse Lookup which meant that lots of machines were showing up with their IP Address instead of the resolved name. 

We have now resolved the DNS issue and tested this via the DNS resolver, which works, however the monitored machines are still displaying the IP Address. 

Rediscovering the machine does not change anything.

Can i force OpManager to resolve the IP of the monitored machines or do i need to delete the machines and discover them all over again?