It looks like everything is set up properly for your Slingbox to work from this end. You can inquire with your ISP to ensure TCP streaming is allowed through your current ISP/router. You could also give them the IP address and port the Slingbox uses to make sure it's not being blocked. Your generation Slingbox uses port 5001 (default) and the default IP address will end in 254 (ie: 192.168.0.254, 192.168.1.254, 10.10.0.254, etc. -depending on your default gateway).
Additionally, here is an article with general information regarding Internet Viewing:
Hope this helps!