When you type in the link (https://epo_server_name:8443/) to log on to the ePO console and press Enter, you’re unexpectedly redirected to:
After you authenticate at the Upgrade Assistant logon page, you’re taken to the Using the McAfee Endpoint Upgrade Assistant page.

You see this issue after you upgrade to ePO 5.10 Update 10.

NOTE: After you log on for a second time (https://epo_server_name:8443/), you’re correctly taken to the ePO dashboard.