How do I redirect a user back to a specific end user page or form after SSO authentication?  

Environment: 

Customer Portal Single Sign-On

Issue:

Users always land on Customer Portal homepage after SSO authentication.

We want the users to be redirected to the original page they tried to visit.

Resolution:

By default, customer portal does not process the relay state or support deep linking.  If you want to redirect the user to a specific page after authentication you have two options;

• Pass the redirect in the ACS URL.  By default, the user will be directed to the Home page after authentication.  You can specify a different page to direct the user after authentication.  Please see How You Redirect Contacts After Login.
• The other option is to create a pre_login hook to intercept the SAML response and parse out the relay state.
•  If you redirected to your identity provider from a Customer Portal page using the configuration setting PTA_EXTERNAL_LOGIN_URL, you can pass the page the user tried to visit to your IdP with %next_page%, as in
  https://<youridp>?someparameter=%next_page%
  Consult the documentation for your identity provider to determine the necessary settings to return the redirect as above. See also the description of PTA_EXTERNAL_LOGIN_URL within the configuration setting editor.