Null key
You can recover from a null key error.
Symptoms
Null keyResolving the problem
This error can happen on WebSphere systems if the server's SPN identity (for example, FNCEWS_mysys@MYDOM.COM ) cannot be found in the Content Platform Engine server's currently configured keytab.
It can also happen
if the keytab file itself cannot be found for some reason, such as
using the default keytab, but that keytab was created by one user
and the app server is running as another user account (a particular
problem if the app server is running as a Windows service). One fix
for this is to specify the keytabPath option for the KrbServerLoginModule,
for example, keytabPath="c:/config/keytab".