Please do the following:
I recommend running the /opt/quest/libexec/vas/scripts/vas_snapshot.sh script before doing the next step. It will create vas_snapshot.(machine-name).tar.gz file in your /tmp directory and will have a copy of your files before unconfiguring.
** warning AD enabled accounts will not be able to login after unconfiguring.
1 - Run /opt/quest/bin/vastool unconfigure
2 - Run /opt/quest/bin/vastool configure nss
3 - Run /opt/quest/bin/vastool configure pam
4 - Run and return /opt/quest/bin/vastool status
5 - Test if the issue still exists.