We have Jenkins 2.176.3 and RTC 6.0.6 and both are connected using teamconcert-plugin 
2.4.0 to utilize SCM for fetching code from RTC streams to use in our Jenkins builds.
 
 
As requested by our client, we have enabled SSO (Single Sign-On) on RTC (SPNEGO), but after that, we start getting the below error. that the server does not accept user id and passwords anymore for auth.
hence we are not able to connect to RTC.