A very large number of server objects can cause this to happen.
Resolution:
To prevent the timeout:
Stop the QlikView Management Service
Go to C:\Program Files\QlikView\Management Service
Open the QVManagementService.exe.config file.
Locate <add key="SocketTimeOutInSeconds" value="600"/> If not present, create the line and adjust value= as required. If present, change the value as required.
Save the file
Start the QlikView Management Console
It will still take some time before the document properties are opened, but at least it should not time out. You might need to set up an even higher value than 600.
To avoid the wait, you will need to clean up the .Shared file, removing all the objects that are not needed anymore.