I've noticed that if I create an AD group for specific access (i.e. users) and then add users to that group I can get this to work; however, I needed to define the group by editing " /etc/syslog/local/authentication.conf" via the CLI. Even if I edit the configuration file and set the limit to 1000+,10000+,100000+,1000000+ it doesn't change the behavior. This makes me think that the issue isn't a LDAP issue, rather a GUI issue. I noticed that even with the limit change the GUI still only shows 1000 entries. Here's what I did to make things work:
Configure the "LDAP strategy" via the GUI.
Edit /etc/syslog/local/authentication.conf"
Under the LDAP definition create your user access similar to the following:
[roleMap_LDAPStrategyName]
user = LDAPGroupName
Restart Splunk
Once I created the new AD config and defined the users via the CLI I restarted splunk and all these users that were supposed to have access were imported. In addition I was able to add new users to the AD group and use the GUI "Reload Authentication Configuration" button on under "Manager » Access controls » Authentication method".
I know this isn't a GUI solution, but it did solve me problem. I'm using Splunk 5.5 on Linux.
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