I can connect to my own SMP server using the offical minecraft client, but when I try to connect using World of Minecraft, I get this:

[INFO] Disconnecting /127.0.0.1:52293: Protocol error
[INFO] Disconnecting /127.0.0.1:52293: Protocol error
[INFO] Disconnecting /127.0.0.1:52293: Protocol error
[INFO] Disconnecting /127.0.0.1:52293: Protocol error
[INFO] Disconnecting /127.0.0.1:52293: Protocol error
[INFO] Disconnecting /127.0.0.1:52293: Protocol error
[INFO] Disconnecting /127.0.0.1:52293: Protocol error
[INFO] Disconnecting /127.0.0.1:52293: Protocol error
[INFO] Disconnecting /127.0.0.1:52293: Protocol error
[INFO] /127.0.0.1:52293 lost connection

I am trying to connect using this URL:

http://www.minecraft.net/play.jsp?ip=127.0.0.1&port=25565

If I switch from localhost IP to the actual IP, the results are the same. I HAVE spent quite a bit of time trying to figure out why this is happeneing, and could not find any answers. Any ideas?