Getting Error Code 28 on Mobile server

Hi Team,

I am getting error code 28 while logging into the Milestone Mobile Server. The Connect command is working, but I am getting this error during the login call. I have checked the appendix, and it says ‘Addresses not reachable.’ Could someone please elaborate on what the exact issue is here and how to fix it?

<?xml version="1.0" encoding="utf-8"?><Communication xmlns:xsd=" XML Schema " xmlns:xsi="``http://www.w3.org/2001/XMLSchema-instance``"><ConnectionId>02167047-7c89-44eb-87e1-3a8dba5e6bcb</ConnectionId><Command SequenceId="2"><Type>Response</Type><Name>LogIn</Name><InputParams /><OutputParams /><Items /><Result>Error</Result><ErrorCode>28</ErrorCode></Command></Communication>