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A version of MOD_CAS is also distribued as RPM Modules.
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We now have a mod_cas patch below for apache2 that contributes support for apache directives for all configuration items. You may also want to try the RPMs. There is a pre-built one for RH AS3, and one that will build mod_cas from source for you. It also contains some changes to logging. mod_cas now has the capability of logging to the apache logs. All that needs to be done, is for someone to turn on the debug directive.
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