Auto login to cpanel from whm list accounts not working. its asking login credentials after whm/cpanel upgradations.
Firstly, Its kind of Browser/Cache Problem which I also Faced. Restart the Server. Then Clear Browser Cache and Cookies. Then Login, It would work!
If its happening only on 1 particular account, it is due to cPHulk Locking out the Username because Bruteforce on it are too much. You have to wait for the timeout before you try to login again
I agree this is most likely to be related to the browser issue. If the "cP" icon shows up in WHM >> List Accounts I would expect the root user to just be able to click that with no additional authentication necessary.
Were you able to test a different browser to see if that is working well?
Were you able to test a different browser to see if that is working well?