If the report Failed to connect to the server application is displayed after your connection attempt, it can be caused by the following reasons:
Invalid username or password. Verify that you have inserted the correct username and password. Bear in mind that the password is case sensitive. Make sure that the Caps Lock mode is not on and that you use the correct language mode.
User does not have administrator rights. Only users with access to the WinRoute Firewall Engine administration will be allowed to use Kerio Administration Console. For details refer to chapter 9.1.
WinRoute Engine is not running on the host to which you are trying to connect. Run it first (using either WinRoute Engine Monitor or the Services panel under Windows NT 4.0 / 2000 / XP).
Remote administration is not allowed or it is only allowed from a certain IP group. See chapter 10.1 for details.