-autodetection fails).
-
-If you use "gss/krb5i", you will also get integrity (ie. authentication), and
-with "gss/krb5p", you'll also get privacy (ie. encryption). Make sure your
-kernel supports this; not all kernels do.
+autodetection fails). On the client, you will need to add "-o sec=krb5" to
+the mount call.
+
+If you use "gss/krb5i" (and correspondingly "-o sec=krb5i" on the client), you
+will also get integrity (ie. authentication), and with "gss/krb5p", you'll also
+get privacy (ie. encryption). Make sure your kernel supports this; not all
+kernels do.
+
+If you receive messages on the server complaining about "client ID already in
+use" when mounting from more than one client, check that you have at least
+mount version 2.12r-14. Also, connecting from behind different NATs could cause
+this kind of issue currently, as two or more clients would believe they had the
+same IP.