My router is blocking a specific IP

[mattorfeed]

So my router seems to be blocking one of my buddies from joining any of the servers I make for gaming. Everyone one else can join my servers except for him. I do not know if this is on his end or my end and I cannot find anything online to fix it. I have an xfinity router.

 

[mattorfeed]

Something to add is he can join my network using a vpn on the computer but it becomes a problem when we are on console and he cant download a vpn