When an IWA Direct realm is created and the proxy joins the domain, the proxy will remember the current trust relationships that exist within the domain. If those trust relationships change, i.e. a domain is removed or added, Visual Policy Manager may not reflect this change when browsing the domain and may still show domains that existed at the time that it joined the domain but no longer exists.
If the domain structure has changed since the IWA Direct realm was created, tests have shown that using Visual Policy Manager to browse a domain can result in the pop-up message "General error communicating with Active Directory" being displayed, even if you are trying to browse a domain that does still exist.
To fix this issue, it is necessary to remove the proxy from the domain and then add it again.