How do I hide ssh number from clients? When I type the following command it displays server version number to end users:
ssh -v server2.example.com OpenSSH_5.3p1 Debian-3ubuntu4, OpenSSL 0.9.8k 25 Mar 2009 debug1: Reading configuration data /home/vivek/.ssh/config debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug1: Connecting to server2.example.com [123.x.y.z] port 22. debug1: Connection established. debug1: identity file /home/vivek/.ssh/identity type -1 debug1: identity file /home/vivek/.ssh/id_rsa type 1 debug1: Checking blacklist file /usr/share/ssh/blacklist.RSA-2048 debug1: Checking blacklist file /etc/ssh/blacklist.RSA-2048 debug1: identity file /home/vivek/.ssh/id_dsa type -1 debug1: Remote protocol version 2.0, remote software version OpenSSH_4.3 debug1: match: OpenSSH_4.3 pat OpenSSH_4* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.3p1 Debian-3ubuntu4
telnet server2.example.com 22 Trying 123.x.y.z... Connected to v.txvip1. Escape character is '^]'. SSH-2.0-OpenSSH_4.3
Why does OpenSSH server report its version to clients?
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Q. I’d like to start my Iptables based firewall when my computer comes online so that it get protected from the Internet? I’m using CentOS Linux Server version 4.x.
A. CentOS / RHEL / Fedora Linux has service located at /etc/init.d/iptables to start firewall on boot. All you have to do is type the following command to turn on firewall on boot:
# chkconfig iptables on
Your firewall rules are saved at /etc/sysconfig/iptables files.