User gets "ocsp-signing-purpose-error" exception page when browsing HTTPS website.

book

Article ID: 167086

calendar_today

Updated On:

Products

ProxySG Software - SGOS

Issue/Introduction

The customer configures an OCSP Responder.

Then, when browsing certain HTTPS websites, the user gets the following error on the exception page:

OCSP Error On Server Certificate (ssl_server_cert_ocsp_check_failed)
OCSP check for server certificate failed due to error: "ocsp-signing-purpose-error"

On the CFSSL Debug (https://ProxySGip:8082/cfssl/debug), you will see the following error:

1315.756 SSLW 2FB0B4AC (EC001E1): OCSP responder 'TestOCSP': OCSP signing purpose error(root ca not trusted)

... or another similar error.

 

Resolution

The Configuration and Management Guide document (CMG), has this to say:

Ignore OCSP signing purpose check: This setting ignores errors which are related to the OCSP signing delegation and applies only to Scenarios B and C. (See"Basic OCSP Setup Scenarios" section.) The errors might occur in one of two ways :

·         Scenario B- The response signer certificate is not delegated for the OCSP signing. The event log records this error as missing ocsp signing usage.

·         Scenario C- The root CA does not have the trust setting enabled for the OCSP Signing. The event log records this error as root ca not trusted.

So, in this error case, the proxy detected that the CA certificate of the server does not have the trust setting enabled for the OCSP signing.

The customer needs to go to Configuration > SSL > OCSP > Edit the OCSP Responder, and check the "Ignore OCSP signing purpose check" option.