One External IP unable to connect

Regardless of the NAT port or Services on the router, I have 1 external IP that can’t connect. I’ve tried other machines with public ip’s and they connect fine. This one machine/ip worked a few days ago but stopped working for some reason. IP > Firewall > Connections doesn’t list the connection attempt either. Also I tried a port scan while trying to connect VPN (PPTP) and it only captured a udp port but not the tcp 1723.

I’m pretty new to RouterOS so I’m not sure where to go, its like the router is denying any attempt to connect from IP X.

Thank You,
Ken

Any feedback on this would be great. I’m clearly a newbie.

Cheers,
Ken