Redirect_uri_mismatch error occurs in Agent 5.x after upgrading from OpenAM 13.5.0

Bug description

Redirect_uri_mismatch error occurs after upgrading in AM 5.x from OpenAM 13.5.0 to AM 6.5.2

redirect_uri_mismatch The redirection URI provided does not match a pre-registered value.

How to reproduce the issue

#1. Installed OOTB OpenAM 13.5.0

#2. Create a web agent profile

#3. Upgrade OpenAM 13.5.0 to AM 6.5.2

#4. Installed Web Agent 5.6.1.1

#5. Access protected page

Expected behaviour

Agent redirect the request to OpenAM for authentication 

Current behaviour

 Encountered this error 

redirect_uri_mismatch The redirection URI provided does not match a pre-registered value.

Work around 

After the upgrade, notice there is an extra slash "/' in the CDSSO Redirect URI

Remove and changed to: agent/cdsso-oauth2

As a side note, noticed that the Web Socket Connection interval is 0 instead of the default 30 minutes

The above issues does not occur in a fresh installation of AM 6.5.x