Error validating exchange logon credentials exchange best practices analyzer
Make sure that you return the database auto activation policy to the original setting if it was not “Unrestricted”.Exchange MVP Michael Van Horenbeeck has published a script for automating the process of starting and stopping maintenance mode.Although this is expected and supported, it is not supported to stay in that state for a long period of time.
If it is interrupted, or fails part way through the installation, you may need to perform a server recovery.
Mailbox servers in a multi-server environment, whether installed as standalone or as a multi-role server, should be placed into maintenance mode before installing the cumulative update.
Note that the redirect target server must be provided as a fully qualified domain name.
The steps for installing cumulative updates and service packs on Exchange 2013 are: If you have multi-role CAS/MBX servers installed then setup updates the roles in the correct order anyway, and you should simply start with the internet-facing servers.
During the deployment of a cumulative update within a site that contains load-balanced Client Access server or Database Availability Group members there will be a period where servers are not at exactly the same version.