I'm getting the below error when doing testconnectivity microsoft tool check. Unsure what else to look at in TMG
Testing HTTP authentication methods for URL https://lyncdiscover.domain.com/Autodiscover/AutodiscoverService.svc/root/user.
HTTP authentication test failed.
Tell me more about this issue and how to resolve it
HTTP 401 status received from server, but X-MS-WebTicketURL not provided.
HTTP Response Headers:
WWW-Authenticate: Negotiate,Kerberos,NTLM,Basic realm="lyncdiscover.domain.com"
Elapsed Time: 216 ms.