After making changes to the LDAP servers on the K1, a red banner appears at the top saying, "LDAP Server Authentication requires at least one server."
The access_log shows: POST /adminui/settings_authentication.php HTTP/1.1" 500 59 1678 528 0
The error_log shows: PHP Warning: Invalid argument supplied for foreach() in /kbox/kboxwww/adminui/settings_authentication.php on line 48, referer: <Your K1 IP>/adminui/settings_authentication.php
Verify that there are not any unexpected spaces, or carriage returns in any of the fields. Copying and pasting each of the fields into a Notepad may be a useful way to find them.
If no errors can be found in all your LDAP AuthAuthenticationnication Servers, delete and recreate all servers.