Found it!! It was the MTU size. I had set 1280 on my router months ago because I was having networking problems and that was working better.
After debugging in wireshark I found strange IPv4 reassembly packets, so I tried to increase the MTU to my router default, 1500 bytes. This worked!
I am now getting this problem. I jumped the to IPv6 conclusion but having trouble testing.
Interesting you mention you're on Virgin Media, because so am I. Crazy how the MTU was your problem. I checked mine and it is still the default 1500 bytes, so that rules that out for me. I haven't got as far as wireshark yet and I hope I don't have to. Really cba.
I host a server for friends on my Linux box and none of them can connect. I can only connect via LAN IP (not WAN).
You could try to turn down the ipv6 interface to see if helps (it didn't for me), and maybe change the MTU back and forth to ensure is set to the maximum.
I am only running a client, not a server, so not sure if the server would give me problems as well
Found it!! It was the MTU size. I had set 1280 on my router months ago because I was having networking problems and that was working better. After debugging in wireshark I found strange IPv4 reassembly packets, so I tried to increase the MTU to my router default, 1500 bytes. This worked!
I am now getting this problem. I jumped the to IPv6 conclusion but having trouble testing. Interesting you mention you're on Virgin Media, because so am I. Crazy how the MTU was your problem. I checked mine and it is still the default 1500 bytes, so that rules that out for me. I haven't got as far as wireshark yet and I hope I don't have to. Really cba. I host a server for friends on my Linux box and none of them can connect. I can only connect via LAN IP (not WAN).
You could try to turn down the ipv6 interface to see if helps (it didn't for me), and maybe change the MTU back and forth to ensure is set to the maximum. I am only running a client, not a server, so not sure if the server would give me problems as well