Symptoms

An error using the custom user manager security label while trying to log on to the K2 task list on the iPhone.

 

Diagnoses

The K2 services web service has been exposed to the internet.
You can log unto to K2 Task list using the active directory credentials and default security label. Using the custom user manager security label, no tasks gets retrieved from the task list.
Commented out in the web.config file of the web service application.
The custom user manager security label has been registered, and you can log unto the k2 workspace using the correct credentials under this security label.
 

Resolution

Download the android app which work with the K2SQLUM security label