kpasswd: Authentication error: Failed reading application request

[Kelledin]

Anyone know why exactly I'm getting this problem?

In short, I have a KDC set up on Linux 2.4.7, and I've configured a 
client's /bin/login to hit the KDC for authentication via pam_krb5.so.

Users can log in just fine, but they can't seem to change their password 
via kpasswd.  It goes something like this:

[ kelledin at Traveller ~ ] # kpasswd
Password for kelledin at SKARPSEY.ATTBI.COM:
Enter new password:
Enter it again:
Authentication error: Failed reading application request

The client is running Linux 2.4.17.  Both client and KDC are running krb5 
v1.2.3.  The server's logs record issuing a ticket for kadmin/changepw and 
that's it.  Does anyone have a clue as to what's happening?

----------
Kelledin
"If a server crashes in a server farm and no one hears it, does it still 
cost four figures to fix?"