I can't go into my friend's multiplayer world. I am always stuck at the Locating Server page but still can't get in after a while.

I have this problem starting from yesterday when i can't go into my friend's minecrafr world. I was able to go into the world yesterday in the afternoon but after that i can't go into the world. If i tried to go in, it would just put me on the Locating Server page and thus unable to go into the world. I hope that you guys can solve the problem for this bug. And also i am able to go to my friend's other worlds. My other friends were also able to go to his world except for me.