internal guests who want to connect to their outside VPNs can not.

Question

We frequently have our customers or suppliers visit my facility to give us presentations, etc. while they are on site, I give them access to our guest wifi. The wifi connection works fine. But, when any of these folks want to try and connect to their office network through the use of any VPN client, they never connect. 
 
 XG135 with latest firmware. 
 
 I have no idea how to allow this simple thing. 
 
 Regards, 
 
 Terry

lferrara · Answer

Terry, 
 find out what ports are the using on VPN tunnel and allow the proper ports. Use log viewer or drop-packet-capture (from console). 
 If they are using SSL VPN with port 443, then create an exception under Web > Exception. 
 Regards