It happens when access to the option Tools/Deploy Application/ deploy to windows Azure
It probably ocurred because a previous deploy was something wrong. The file %AppData%\Artech\GeneXus\10Ev2\KBNAME.azure. has all the information about the previous deploy.
It could be possible to delete this file in order to avoid this behaviour
Make sure the C# environment used to deploy is IIS 7.0 or higher.
More information on SAC #35093.
(error message sample)
Uploading file 'Demo20141210u6PatternDevService.cspkg'... done!
Deploying 'miuracloudservice' to Windows Azure from http://miurastorageservice.blob.core.windows.net/miurablobcontainer1/Demo20141210u6PatternDevService.cspkg. This operation may take a while.
error: An error ccourred while trying to get the list of available Hosted Services.
error: リモート サーバーがエラーを返しました: (403) 使用不可能
-> make sure to upload certificate.