weblogic 9.2.2 change admin password

We changed the admin password, updated boot.properties and everything seems to work fine.  Every twenty seconds or so, we are getting the following entry in the log file.  We have verified all interfacing applications are using their own password and not the admin password.  Any suggestions on finding what system is attempting to log onto the server?
<Apr 26, 2010 9:54:53 AM CDT> <Warning> <com.bea.weblogic.kernel> <000000> <Throwing FailedLoginException(Authentication Failed: User weblogic. Invalid password supplied.)>

Using Weblogic 9.2.2 for use with UIM.
 
Thanks,
Oscar