SimpleSAMLphp Failed to verify signature error

Question

SimpleSAML_Error_Error: UNHANDLEDEXCEPTION

Backtrace:
0 simplesamlphp/www/module.php:189 (N/A)
Caused by: Exception: Unable to validate Signature

    Backtrace:
    6 simplesamlphp/lib/SAML2/Utils.php:149 (SAML2_Utils::validateSignature)
    5 simplesamlphp/lib/SAML2/Assertion.php:494 (SAML2_Assertion::validate)
    4 simplesamlphp/modules/saml/lib/Message.php:185 (sspmod_saml_Message::checkSign)
    3 simplesamlphp/modules/saml/lib/Message.php:560 (sspmod_saml_Message::processAssertion)
    2 simplesamlphp/modules/saml/lib/Message.php:532 (sspmod_saml_Message::processResponse)
    1 simplesamlphp/modules/saml/www/sp/saml2-acs.php:81 (require)
    0 simplesamlphp/www/module.php:144 (N/A)

I get an error message when I log in to a site running SimpleSAMLphp. It started when the SSL certificate on the server expired, but has since been updated to a new valid certificate. I assumed that this will fix the error, but as you can see, it is not.

I could not find someone else with the same problem, so I have to miss something obvious.

Answer 1

• Get new metadata from an identity provider.
• Update metadata on the side of the service provider.

The authentication certificate is lost / renewed several times, but the SP still has the old one.

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