In the Kerberos (GSSAPI/SSPI) section, the server and principal domains are currently:

// KDC Server
var server = "kerberos.example.com";
var principal = "drivers@KERBEROS.EXAMPLE.COM";

It could be confusing for the KDC domain and MongoDB server to be the same. Perhaps this is better:

var server = "mongo-server.example.com";
var principal = "drivers@KERBEROS.EXAMPLE.COM";

This change originates from a community user who made a similar suggestion for the Python and Casbah docs. See FREE-137466.