old thread: https://www.reddit.com/r/Bitcoin/comments/66hoqa/cannot_get_more_than_8_connections_even_though/

I'm completely synced up now too. When I check my node with bitnodes.21.co, I see their IP address show up in my Peers Debug Window, but I'm unable to ping them, see their user-agent, or exchange any data.

I've confirmed port 8333 is open. What could be going wrong??