AP 30 never moves from inactive to active in XG

Question

I have reset the AP 30 via the RED-AP_RecoveryApp.exe, and accepted it in the Pending section. 
 The AP then appears above in the Active/Inactive Access Points list, but remains inactive. 
 I'm assuming there is some communication issue, but I've changed cables, etc. with no luck. Could the firewall be blocking this? How would I check?

rfcat_vk · Accepted Answer

Hi, 
 please provide a simple drawing showing how the AP connects to the XG, including all switches. 
 Ian