Smith, Albert L CTR OSD OUSD ATL (US) wrote:
Hello,

I'm running RHEL6 with "httpd-2.2.15-53" and "mod_nss-1.0.10-6".

My webserver is currently configured to do revocation checking vi OCSP and is 
working fine, except when we encounter failures with the OCSP service provider.

I would like to configure my webserver to check OCSP first, and in the case of 
a failure, use CRL files (either local files on disk or CRL files loaded into 
the NSS database) as a secondary.  (If OCSP then CRL isn't possible, is CRL 
then OCSP possible?)

Is this possible, and if it is what are the relevant NSS directives to set?

NSS will check a CRL automatically if one has been loaded (see crlutil). It does this before doing an OCSP check.

The behavior you're seeing won't really change though. If the OCSP check cannot be made then the request will fail. There is no configuration setting to tune that.

For automated CRL handling you might want to look at mod_revocator, another Apache module. This will retrieve and load updated CRLs without requiring a restart of Apache.

rob

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