I'm trying to create a Synchronization Connection by going to Central Administration > Manage Service Applications > User Profile Service Application > Configure Synchronization Connections. When I click 'Create New Connection' I get the following error: 'Cannot navigate to the requested page while User Profile Synchronization is running. Please wait for the current Synchronization run to finish.' So, then I go to Timer Job Status and click 'Running', and it shows no jobs running. What am I missing?
If the UPSA is running, and not stopping, you can force stop the service using PowerShell:
Run the first line, copy the GUID of UPSA and run the second line with the GUID. Continue to configure Syncronization Connections in Central Admin.