We currently have a Moodle server set up that has LDAP authentication working correctly. What I am trying to set up now is SSO for Moodle and Google. I have installed the Moodle modules and run the diagnostics and everything is reported as being configured correctly. I have entered all of the relevant settings into the Google Control Panel and again everything seems to look OK. The problem occurs as soon as I tick the Enable SSO box. Once ticked the login redirect works, but it will no longer accept any combination of username and password. Untick the Enable SSO box in Google and I can log into the two systems separately again without problems.
I have spoken to support at Google and they have suggested there is an exception on our server which terminates the SSO flow before sending the SAMLResponse.
I'd really like to get this sorted as we are secondary school and we plan to have this SSO up and running for the new term in September.
Thanks in advance.