It appears that I successfully upgraded from 4.0.2 to 4.3.4.  My portal is back up and running, but I can't login to any of my accounts including Host.  I'm able to create a new account and login.  I can see the old accounts in the database.  For the old accounts, using the password reminder results in an error: "There was an error retrieving your password. No password was sent.".  The new account can using the password reminder without error.

Is this a known issue?  Is there a way to reset the host password so I can log back in?

Usually when this happens, it's because you didn't copy the machine keys over to web.config before running the upgrade.  Double-check that. 

There is a way you can reset the host password, but it's better to revert back to the original encryption keys, thereby re-enabling all of the accounts.

when you do not have the old web.config is there any other way to reset the host and admin password?

Thanks.