When I login to active directory in Windows, another Zenworks window comes up asking for login. when I login with my AD username and password I get an error stating.

Unable to log into the network because the login credential or the server certificate is incorrect.

Now I did search the forums and found that master list of troubleshooting articles. however, none of them i think apply to me at all. I cannot login on initial bootup, nor can i right click the Z icon and login.

up until a few months ago, passthrough authentication was working fine, but now we just have to hit cancel and it lets us into windows. Help?