I have /boot/vmlinuz-2.6.18-8.el5 but not /boot/vmlinux-2.4.21-40.ELsmp , and let me make one point clear i have rhel version 5 as the netdump server , and the client server that was crashed is a version 3 rhel. Dave that so kind of you for a good suggestion . But is there any other way i can achieve this.