Can't connect to Minecraft server? - 2

Hi. My friend has a Minecraft server which I'm trying to connect to. All his other friends are able to connect to his server (From their own routers).

I have isolated the problem, so we know it's a problem with MY router.
Because:
When I connect my computer to another wireless router, I can connect to the server.
When I use another computer on my network, it can't connect.
Other people can connect to his server.

I have tried to open the port 25699 on my router, but with no results (25699 is the port, his server is using).

I have also disabled my router's Firewall, but with no results either.

And of cause a restart of my router didn't work either.

What should I do, to be able to connect to his server?

Thanks in advance.

Andreas.

Added (1). And I'm able to connect to any other Minecraft server. But not his server.

If you have a minecraft that if you want to login you just enter a nickname, it is a cracked minecraft. And maybe this server doesn't work in cracked minecraft

How did you test your theory of "When I connect my computer to another wireless router, I can connect to the server. When I use another computer on my network, it can't connect."?

If this is true, why not just connect with the other router that you tested that worked?

Since you're the one connecting, you don't need to open that port. You only open it if you're the one hosting.

Are you sure you typed in the correct I.P. Address?

I know this may not be the case, but are you on his "white-list" or whatever the list is called that blocks certain players?

You can also try disabling your Anti-virus for the time being. Some Anti-viruses cause problems when playing online games due to the fact it may block certain "things" that the game requires to connect.

Should you need anymore help, click on the following link(s):
http://www.minecraftforum.net/...my-server/
http://community.playstarbound.com/index.php?threads/cannot-connect-to-my-friends-server.38176/page-2

Hope this has helped you and good luck!
Regards,

Oscar M.