I am having enormous problems with something that was so simple in 6.x.
I have my CUCM 7.0 Publisher and I add the subscriber server on the publisher first. I configure DNS for forward and reverse resolution and validate this. I do the install and I get an error stating the subscriber cannot be validated by the publisher. Sometimes I get an unable to synchronize with NTP error even though the publisher is synched. I have tried without using DNS and still cannot install the subscriber. I had no such problems with 6.x.
Please helpe if you can.