[Users] what can cause NETWORK_UNREACHABLE

------=_Part_189959_529823293.1363855515951 Content-Type: text/plain; charset=GBK Content-Transfer-Encoding: 7bit hi,all on UI always there is a alert 'NonOperationalReason___NETWORK_UNREACHABLE', could you tell me , what cause this problem. how to fix it? thanks ------=_Part_189959_529823293.1363855515951 Content-Type: text/html; charset=GBK Content-Transfer-Encoding: 7bit <div style="line-height:1.7;color:#000000;font-size:14px;font-family:arial">hi,all<div>on UI always there is a alert 'NonOperationalReason___NETWORK_UNREACHABLE',</div><div>could you tell me , what &nbsp;cause this problem. how to fix it?</div><div><br></div><div>thanks</div></div><br><br><span title="neteasefooter"><span id="netease_mail_footer"></span></span> ------=_Part_189959_529823293.1363855515951--