When logging into the VCSA appliance management interface, you will receive the Exception in invoking authentication handler User password expired error message if your vCenter / VCSA root password has expired.
To restore access, connect to the VCSA’s console, or via SSH:
Once connected, type shell
to enter the bash shell. Once there, type passwd
to set a new password for the vCenter appliance root account:
# passwd
New password:
Retype new password:
passwd:
password updated successfully
Exit the console session once done. You should now be able to log into the VMware vCenter appliance management interface successfully: