I am trying to evaluate the IPAM module but am not able to add a second DHCP server. I was able to add one server just fine, but when I add the second it fails right away with "There are no more endpoints available from the endpoint mapper". I have confirmed RPC on the server and no blocking on port 135 or greater than 1024. The error says to "see troubleshooting steps", but that page has no mention of this type of error.
This issue is probably caused by blocked communication in your network (generally ports in range between 1024 - 65535).
To resolve this situation, just follow the instuctions on the following website (step 4):
you can also open support ticket on solarwinds.com