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What is OpenSSH?

OpenSSH is a free, open source implementation of the SSH (Secure Shell) protocols. It replaces telnet, ftp, rlogin, rsh, and rcp with secure, encrypted network connectivity tools. OpenSSH supports versions 1.3, 1.5, and 2 of the SSH protocol. Since OpenSSH version 2.9, the default protocol is version 2, which uses

What is Swap Space?

Swap space or Virtual Memory in Linux is used when the amount of physical memory (RAM) is full. If the system needs more memory resources and the RAM is full, inactive pages in memory are moved to the swap space. While swap space can help machines with insufficient amount of

Redhat / CentOS / Fedora Linux Open Port

Red Hat Enterprise Linux 3 / 4 / 5 and above => Old Red hat Linux version => CentOS 4 and above => Fedora Linux 1) Open port 80 Open flle /etc/sysconfig/iptables: # vi /etc/sysconfig/iptables Append rule as follows: -A RH-Firewall-1-INPUT -m state –state NEW -m tcp -p tcp –dport

Determine what hardware we have in our Linux server?

Within Linux, you can find any relevant information you may be seeking about what hardware is installed. There are several methods and sources of information to achieve this. Firstly, there’s the procfs mounted on /proc; a virtual file system containing information about processes and also about hardware. Examples: (~)$: cat

Change the default kernel that boots from GRUB

The GRUB configuration file can be found in /boot/grub/. [root@root /boot/grub]# ls -la grub.conf menu.lst -rw——-    1 root     root         1037 Oct 28 11:41 grub.conf lrwxr-xr-x    1 root     root           11 Jan  1  2003 menu.lst -> ./grub.conf If grub.conf does not exist then simply edit menu.lst which should be a file instead

Prevent hotlinking

Others can link to images on your site to use them on their own web site, forums and elsewhere. This is of no benefit to you and can increase the bandwidth usage for your hosting account quite a bit. 1. Activate Protection To prevent people from hotlinking to your files

What to check, if you are unable to publish with Frontpage ?

First, you must make sure that your domain name is live and pointing to the server that your hosting account is on. You will NOT be able to publish to the server, if your domain name is not yet working. Second, make sure that you have enabled Front Page Extensions,

Use Windows to block IP’s and IP ranges

If you dont have control over a router or firewall you can block IP’s at the server via Windows. Click ‘Start’ > ‘Run’ >type ‘MMC’ press ok. In the console click > ‘File’ > ‘Add/Remove Snap in’ In the ‘Standalone Tab’ click The ‘add’ button Seclect ‘IP Security Policy Managment’

Quick check for a ddos via number of connections

A quick and usefull command for checking if a server is under ddos is: netstat -anp |grep ‘tcp\|udp’ | awk ‘{print $5}’ | cut -d: -f1 | sort | uniq -c | sort -n That will list the IPs taking the most amount of connections to a server. It is