Hi,
I had completed the hybrid mode on my Exchange server 2013, which is working on all.
After I changed my public IP addresses (1 x public IP address is one to one mapping to Exchange server; 1 x public address is Firewall outside interface (NAT PAT)). Now, I cannot migrate back the online user to Exchange on-perm. as the below error.
I really don't know why just change the public IP addresses, then cannot work on the hybrid communication?