question regarding suid

Hi

I have made a script tc.sh which executes some commands of iptables. Now I want that other users also should be able to execute this script, so I set the suid using chmod 4755. But even after setting the suid, other users still cannot execute the script. Is it the problem with iptables or suid????

It could be permissions on the directory where the file is located. If the users cannot read from the directory, then the file will not be available to them to run.