(Connection Timed Out) No response from Host

[kanere23]

i tried to use the CO-OP Mod with my friends.
the server works inside my network, but it doesn't want to announce the server.
so i don't know if that is the problem, or something else.

this is what i and my friend are getting as a message
i have portfowarded it to port 4499 and UDP/TCP.
and i have checked for my port in my firewall from windows.

this is what i see at my console if i am joining.

already thanks for reading this issue