Activiti 1.4 SSO login not working

Team,

We have custom jar file , which is responsible for communicate with SiteMinder and activiti.
Jar is developed and provided by alfresco team : siteminder-tryout-1.0-SNAPSHOT.jar

Now what is happening when I am using my SSO login it gets me to dashboard page while finishing SSO process then suddenly redirecting to login page again.
I am not figuring out any problem now.

There is no specific logs in activiti (catalina.out)

When I observe via chrome element :

I can see below things with specific call :

Request URL:https://xxx.com/activiti-app/app/rest/authenticate
Request Method:GET
Status Code:401 Unauthorized
Remote Address:xxx:443