Hi dave and all As i have said to you previously the netdump server i am using is version redhat 5 , and the netdump client version is a AS 3 redhat. Now i have reached a stage where i am having the vmcore file of a crashed AS 3 redhat and i am going to run my crash utility on the netdump server version 5 . I have installed the kernel-debuginfo.2.4.21.40.EL.i686.rpm which is equvivalent to the crashed kernel version AS 3 . Dave, as you suggested to look for and execute crash <path-to>/vmlinux-2.4.21-40.ELsmp <path-to>/vmlinux-2.4.21-40.ELsmp.debug <path-to>/vmcore But the fact is i dont have /boot/vmlinux-2.4.21-40.ELsmp , instead i have /boot/vmlinuz-2.6.18-8.el5 , which make sence because its a redhat version 5 machine. SO do i need to install secondary kernel version that match the crashed version? So what i presume from this is that crash utility can be run on the machine which run the same version as that of the crashed version . Is that right or am i wrong , i dont know. Where do i go from here . Waiting eagerly for a reply . Regards -- Anirudh Srinivasan