Server Configuration > Post Install Server Security > Special Considerations for Kerberos and Kerberos Single Sign On > Connection Preferences Are Ignored
  
Connection Preferences Are Ignored
The use of Kerberos SSO as an authentication domain causes Windchill RV&S to ignore the user connection preferences to prompt for a user name and password. This means that users are unable to connect using the Kerberos SSO authentication domain if they use connection preferences to set a user name that does not match the login user name for each user’s machine.