Clearing the cache in SSSD
SSSD is the latest security infrastructure for Red Hat type servers. It is used extensively in the 6.x series. Unfortunately, there is a bug in it that does not allow you to dump the cache. So, removing invalid information is trying. According to the documentation, you are supposed to use a tool called sss_cache to do this. In 6.4, it does not work. The way around this is to actually delete the cache files.
# rm -rf /var/lib/sss/db/*