Well, you have 2 options;
1. Connect your modem directly to your PC and take the router out of the picture to see if it works with a direct connection.
2. If that isn't an option (router built into the modem), then try setting your server PC as a DMZ in your router. That will open all ports directly to it. It is not recommended to keep that setting, because it is risky for security. But, if it works as a DMZ, it just needs the ports forwarded properly in the router settings.
Make sure you are doing "port range forwarding" and not just "port forwarding". Even though they sound like the same thing, they are not the same thing. Port range forwarding forwards a range of ports directly to an IP address you specify on your LAN. Port forwarding forwards one port to another port to a destination LAN address. So, port forwarding might change all traffic destined for port 5000 to another port of 6000 and send it to your destination address. When I upgraded my router BIOS I had both port and port range forwarding. I mistakenly set the wrong one first and it didn't work at all. Changed it to port range forwarding and worked perfectly.
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