Please verify the admin account used to connect to the Location Manager password has not expired.
Please follow the doc link below and reset the admin password if needed.
https://docs.vmware.com/en/VMware-NSX/4.0/administration/GUID-8816B842-2EC4-40A8-A618-F68DB29FABD2.htmlFrom the Global Manager UI, navigate to System-->Location Manager-->Under Locations section choose: Actions-->Edit settings.
Updating the admin password in the Location Manager section for each of the locations to allow stats to be viewed from both the Global and Local Managers.