Assets - Servers aren't being scanned for changes

Assets - Servers aren't being scanned for changes

Hello,
Current Build: 8100
We have a number of servers that are not being scanned.  Also, some of the servers are virturals.  Our workstations seem to scan with out any issues for the most part.
We are an Active Directory environment
Does anyone have any idea of things that I can check on the servers to get them to scan ?

                  New to ADSelfService Plus?