How can i connect my new android mobile to the server please?All details are correct,i.e password,username,ports ,but it won't connect.?

I'm guessing wifi? Make sure wifi is enabled, try disabling cellular data to see if that helps. Also, it's possible that the security settings on the network are such that new connections must be authorized by an administrator. That would have to be done through the router admin page.

If all the settings are actually correct. then there is something wrong with your phone. Seeing as how all others are connecting to the server just fine. The more likely case is that a setting is actualy not correct. So unless you tell all the settings you have we cant say what went wrong.