Fedora Linux

How do I install nmap command under CentOS / RHEL or Red Hat Enterprise Linux based system for testing security of my own network?

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I‘ve recently swiched from Ubuntu Linux to CentOS / RHEL / Scientific Linux version 6 gnome desktop. However, I’m unable to find the gpass the password manager for GNOME2 desktop in repo. How do I install the same under RHEL 6 or CentOS or Scientific Linux 6 or Fedora Linux 15?

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When I run ‘yum install package‘ or ‘yum update‘ commands the yum command works normally until Running Transaction Test and hangs until the yum process is killed manually using the kill command. How do I fix this problem under CentOS Linux 5.x AMD64 running on HP server?

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I would like to to delete my iptables based firewall rules under Linux. How do I delete rules individually or all at once under CentOS or Fedora Linux or RHEL based servers?

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How do I verify that the system using correct GPG keys to verify all patches, packages and update installed from RHN or repo under RHEL 5 or 6 server operating systems?

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How do I install whois client to see whois information about domain and ip address using command line options under Fedora / RHEL / Redhat / CentOS / Scientific Linux?

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I’ve edited /etc/ssh/sshd_config to change the port number:

Port 1255

However, I’m getting an error as follows:

sshd[26792]: error: Bind to port 1255 on 192.168.1.100 failed: Permission denied

How do I change default OpenSSH port number from 22 to 1255 under RedHat Enterprise Linux server version 6 and SELinux?

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