What steps did you take in changing the IP address? Was it CM business edition? If you don't do it correctly, you'll get the database error. Business edition doesn't support changing the IP address.
I changed the IP address of the publisher. He's restarted. Then I did the same with the subscriber.
best regards,
Getting Started
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: