Hi, Although this is on RHEL 4 update 2 x86-64 I would like to place the question on this list. I'm trying to set up some shell limits for a user. I've added the user to /etc/security/limits.conf There is an entry in /etc/pam.d/login with pam_limits.so as well as in /etc/pam.d/sshd When I try to set ulimit -n <value> I get : cannot modify limit : Operation not permitted Even if I replace all entries in /etc/pam.d/login with the absolute path to /lib64/security it doesn't work. Any suggestions on where to look now ? thanks, Peter