Connection timeout for ssh server

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http://askubuntu.com – I'm trying to setup openssh-server, but I'm having some issues connecting. I changed the port to something non-standard (57757) and then set my router to forward to that port. On my LAN, I'm able to ssh into my machine fine using port 57757, but not able to do so on the WAN. If I'm outside the LAN, and I try to access my machine by an incorrect port, I immediately get a "connection refused" message. However, with the correct port it just hangs and then timeouts. What can I try to debug the issue? I tried a traceroute, but it didn't tell me anything useful. (HowTos)