I'm completely new to SSO, so please bear with me...
I have built an application (Service Provider) and I want to use Salesforce as the SSO IdP using SAML 2.0.
When being redirected to Salesforce to authenticate the user, I get a 'Single Sign On Error: Invalid HTTP method' error and the page URL ends with 'SamlError?idpError=1505'
I have included my configurationSalesforce Connected App Config