Pls help: authentication fail on x86_64 Linux

[S.T. Wong]

Hi all,

I was running Cistron Radius 1.6.6 on RedHat 8.0 (i386) for years
without problem.   Recently I try to migrate the server to new hardware
running CentOS 4.4 (x86_64) with Cistron Radius 1.6.8.  Authentication
from all radius clients except local host failed.  After some debugging,
found that the user password sent from remote radius clients (I used
radclient and Perl module Authen::Radius) can't be decrypted correctly
on the new machine.
However, authentication works if I use executable compiled on the RedHat
8 i386 machine and run it on the new x86_64 hardware with the same
configuration files.    I wonder if the case relates to the md5 code.

I searched the faq and doc but have no idea about the cause of problem.
Would anyone advice if I've anything missed?

Thank you very much.
ST Wong