I recently encountered a strange problem. I doubt anyone here can fix it, but I posted it nonetheless.
My friend just started playing BL again, after about 2 years of inactivity. He wanted me to help him work on a build together. However, he can't join my server, and I can't join his.
The strange part is that other people can join both of our servers. We live on the same street, I'm not sure if that affects anything. We tried connecting straight to the IPs, disabling and enabling UPnP, and even port forwarding.
Can anyone provide some insight into this?