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Windows XP | IE 7

Hi guys,

From time to time, I'm seeing the following error come up:

Revocation information for the security certificate for this site is not available. Do you want to proceed?

However when I manually try retrieving the CRL file in IE, it works fine.


  • How often does Windows request a CRL for a respective CA?
  • When does this happen?
  • Where is the CRL data cached?


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Did you check to see if the certificate references an OCSP source also? Most browsers do not auto-import CRLs, but they may make an OCSP request.

You can view this by looking at the Authority Information Access (AIA) portion of an x509 certificate


Not Critical CA Issuers: URI: OCSP: URI:

You can read over the pertinent RFC at

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