The Issue we opened to this problem was 21559975-1: SINGLE SIGNON USERNAME FORMAT, after activating external authentication as discribed in "TEC512629 - How to Configure External Authentication for Service Desk using IIS70?", the single signo doesn't work as needed.
The following Options for SSO are needed:
- To get SSO working, User Login have to be saved in the format <user>@<domain>
- The LDAP interface have to be changed for this
- Automated migration of the User Login is needed