When a server has more than one IP address, then postfix will use all IP addresses randomly to send out emails. This can cause your emails to be listed as SPAM on other servers because the sending IP does not match the reverse IP of the server hostname. The solution is to bind postfix to ... Read more
The majority of graphical environments let you choose to remember the passwords you enter somewhere to ease access to something but they usually don't tell you how to delete them again. Most Linux desktop distributions have a tool installed where all your saved passwords for network drives are stored in that is called Passwords and ... Read more
FFmpeg has been removed from Ubuntu 14.04 and was replaced by Libav. This decision has been reversed so that FFmpeg is available now in Ubuntu 15.04 again, but there is still no official package for 14.04. In this tutorial, I will show you how to install FFmpeg from mc3man ppa. Add the mc3man ppa: sudo ... Read more
High page speed and short page load times of your website are essential for good search engine rankings today. In this FAQ, I will show you how to enable caching of graphic and CSS files in apache on Ubuntu and Debian. The first step is to enable the expires module in apache: a2enmod headers expires ... Read more
The SCP command line is commonly used to copy files over SSH, and between popular Operating systems like Linux, Mac and Windows in a secure fashion. SCP is used to copy files to/from a remote server. It also allows you to copy files from one remote server to another remote server, without passing traffic through your PC.
Here is a list of ports that are used commonly on ISPConfig 3 servers. If you don't have all services installed or if you e.g. don't want to connect to MySQL from external servers, then close the unused or unwanted ports. TCP ports 20 - FTP Data 21 - FTP Command 22 - SSH 25 ... Read more
The following guide shows how to disable and remove mysql replication from two or more mysql servers. These steps can be used for master/slave and master/master mysql setups. The following SQL commands have to be be executed in phpmyadmin or with the mysql commandline program. It is just important that you are logged in as ... Read more
Just as in Windows you have the option to rotate your screen into any direction in Linux, too. While in Windows you only need to press some keys, a key combination is not configured in Linux by default. But as you may have figured out, there are some terminal commands that let you do the ... Read more
Here is a short script that helped me to copy files that have ben modified within the last 60 minutes to a new directory. The script uses a combination of the find and cp commands, it has to be run inside the directory that contains the new files. In this example, I will copy all ... Read more
It may occur that by default your computer won't connect to wireless networks after starting up the system. A way to solve this might be to install the WICD network manager which is available in the Ubuntu repositories. Just fire up Synaptic Package Manager and search for WICD. During installation, you will be asked to ... Read more