I can't log onto servers

Check that your screen name doesn't use any strange characters.

My sons both have a Galaxy tab. While one of them could connect to the Lifeboat Server instantly, the other could not. It was rather frustrating, and an answer was nowhere to be found, an answer that solved the problem that is. So we installed MCPE on my Galaxy tab as well, and tried to connect to the server. It worked in an instant.

So why would two tabs work just fine, while the third one wouldn't? In our case it was my son's screen name that would not allow him to connect to the world. To make sure we were on the right track we changed the screen names on all three tabs, and BINGO, it was the screen name indeed. My son now has a new name, and with that he can connect.