The Apache mod_auth_vas module is not authenticating. When it is fixed by resetting the password on the HTTP service account, QAS authentication stops working
Both HTTP.keytab and host.keytab are pointing to the same account. This can be caused by manually creating the HTTP.keytab rather than allowing the setup-mod_auth_vas script to create the required entries.
1) mv /etc/opt/quest/vas/HTTP.keytab /etc/opt/quest/vas/HTTP.keytab.sav
These steps will create a new MAV keytab and associated service account.