First published on TECHNET on Oct 24, 2017
When creating a maintenance schedule, selecting more than 216 target objects (these can be any specific entity instances or groups) might result in the Operations Console to disconnect with the following error:
"The client has been disconnected from the server. Please call ManagementGroup.Reconnect() to reestablish the connection."
You can use the following alternate option to put large number of objects in maintenance mode using a single maintenance schedule:
Create a single group or multiple groups with all the objects you would like to put in maintenance schedule
Create a maintenance schedule with these groups (number of groups should be less than 216)