By default, the certificate revocation list (CRL) is not checked when verifying the signature on System Center 2012 Configuration Manager software updates. Checking the CRL each time a certificate is used offers more security against using a certificate that has been revoked, but it introduces a connection delay and incurs additional processing on the computer performing the CRL check.
If used, CRL checking must be enabled on the Configuration Manager consoles that process software updates.
To enable CRL checking
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On the computer performing the CRL check, from the product DVD, run the following from a command prompt: \SMSSETUP\BIN\X64\<language>\UpdDwnldCfg.exe/checkrevocation.
For example, for English (US) you would run \SMSSETUP\BIN\X64\00000409\UpdDwnldCfg.exe /checkrevocation