When attempting to switch from the Global Manager GUI to a Local Manager via the locations drop-down, the redirection process times out and eventually fails:
VMware NSX
Connectivity of the LM, from the GM could be down. Check the status from System > Configuration > Location Manager.
If the connectivity status is not 'Up' (green), verify that the SHA-256 thumbprint is correct. You can retrieve this from one of the Local Manager nodes via the CLI using the command get certificate cluster thumbprint. Re-enter the credentials, check compatibility, and click save. Finally, verify that connectivity is restored.