I know this thread is a few years old, but I hope you are still active. Splunk is not pulling the OID off of smartcards to handle the full login itself. So, we set up Apache and I made the remoteUser and RequestHeader configurations you described. When Splunk receives the header, nothing happens though. It logs an entry that ProxySSO is not configured. Have you seen this issue and know how to get past it to still use LDAP authentication in Splunk but passing the user name to from the Proxy via your described method? ... View more

Did you get this figured out? We are currently fighting the same issue. ... View more