The NSX Manager User Interface may be inaccessible when the Management Plane upgrade is in progress.

Problem

The NSX-T upgrade has been running longer than expected and the NSX Manager user interface is not accessible.

Cause

The NSX Manager user interface is inaccessible during the upgrade of the Management Plane.

Solution

The inaccessability of the NSX Manager user interface does not necessarily indicate an upgrade failure. To verify the upgrade status, run the following command from the NSX-Manager CLI:
get upgrade progress-status
If you see an upgrade failure, follow the troubleshooting steps that are displayed in the command output.