I compiled the latest pam_radius-1.3.17, on Red Hat Linux AS 4.0 Update4. When I ran 'make', I got: "cc -Wall -fPIC -c pam_radius_auth.c -o pam_radius_auth.o pam_radius_auth.c: In function `pam_sm_authenticate': pam_radius_auth.c:1102: warning: assignment from incompatible pointer type cc -Wall -fPIC -c -o md5.o md5.c ld -Bshareable pam_radius_auth.o md5.o -lpam -o pam_radius_auth.so" -and it looked like it created the 'pam_radius_auth.so". When I 'file pam_radius_auth.so', it shows: "pam_radius_auth.so: ELF 64-bit LSB shared object, AMD x86-64, version 1 (SYSV), not stripped" which to me looks fine, and added it to /lib/security. I added "auth sufficient pam_radius_auth.so" to /etc/pam.d/sshd and "auth sufficient /lib/security/pam_radius_auth.so" to /etc/pam.d/ system.auth files. I tested w/ ssh, it doesn't authenticate. Will it work w/ 64- bit? Thanks. -Gabe