It was logging some things, but whenever I attempted to use a valid LDAP credential, it didn’t seem to write anything to the log (even though the date of the nadi-debug.log file was updated!). After a lot of testing and troubleshooting, it appears to be a conflict with Wordfence. I have network disabled the Wordfence plugin now on the site and NADI authentication (including logging) seems to be functioning again. Not sure what parts of Wordfence are interfering however. It would be nice if the NADI and Wordfence plugins play well with each other!
