The form is missing the variable SAMLResponse

I am trying to implement SSO. I have configured several IdP’s and mostly are working fine but for 1 particuar IdP SSO is failing with Error Message as “The form is missing the variable SAMLResponse”.
Could you please help me identify the problem?

I am attaching the related SAML Trace message and saml.config file.


Thank you for including the log file and configuration.
The HTTP Post from the IdP is missing the following HTTP header:
Content-Type: application/x-www-form-urlencoded
Please ask the IdP to include this header.

Thanks your solution worked.

You’re welcome.