Application Server Agent (ASA) & Trust Association Interceptors(TAI) set up for Single Sign-On. ASA and TAI are critical parts when implementing Single Sign-On in a multiple federated Light Weight Directory Protocol’s environments. There needs to be a presence of web agents on the web servers to intercept the web requests and an ASA agent on the Application Servers to intercept the Application Server’s requests. Then you enable TAI on your Application Servers to intercept the requests and perform Single Sign-On. We need to understand the request flow to achieve a successful Single Sign-On authentication. The key to achieve SSO is to intercept the user requests and update the HTTP headers with LTPA or other authentication tokens from Application1 to successfully authenticate onto Application2. Single-Sign-On between any two or multiple systems can be achieved in a Federated repository configuration.