android 端调用注册于登陆失败，并返回 Server response timeout code 301

用后台直接创建用户后，手机端与模拟器上调用login 都提示Server response timeout，注册也只回复errorCode 208 Registration failed.
 
错误如下：
[EMARHttpAPI] can't catch exceptions
fetchTokenForUser return code : 408  response :  and error desc: 
restBaseUrl()
EMDNSManager::getNextAvailableHost: type: 3
EMSessionManager::checkDNS()
EMDNSManager::getNextAvailableHost: new index: 2
EMDNSManager::getHost: type: 3
current host: domain: a3.easemob.com port: 443
[retrieve token time] 0: 0:  8
fetchToken can't fetch user token: 301
[EMClient] do stop service
登录聊天服务器失败！  Server response timeout code=  301
 
 
手机上切换wifi与4g都没用，请问是什么原因？