Using PHP-FPM (FastCGI Process Manager) to run web pages and web applications has many advantages, especially when compared to older techniques such as PHP running as an Apache module. One of the most important benefits is that PHP-FPM significantly improves performance and scalability by allowing finer-grained management and optimization of PHP processes. In this way, we can use the server's resources more efficiently, reduce the response time, and our system can remain stable even in the event of heavy traffic. However, over time, the PHP versions of our web applications may become outdated, which the various control panels do not update. In this description, we will see in a few steps how we can easily modify our manual settings so that our websites and web applications also work with the correct PHP version.

When conducting electronic correspondence, mail servers strive to filter out unsolicited mail (spam) as efficiently as possible. From time to time it happens that these spam filtering services get blocked by letters that do not contain anything that would justify this. Therefore, it may happen with us that we cannot send an email to a recipient, or that we cannot receive mail from others on our own server. In this description, we will investigate one of the more common server-side "554 5.7.1 Service unavailable; Client host blocked using zen.spamhaus.org; Error: open resolver;" type error.

Our websites are constantly under attack from the outside world. The vast majority of these are done by robots, which try to discover the weak points of the websites running on the server. Some of the robots with this purpose try to do this by making various seemingly random HTTP requests to our websites, most of which are directed to non-existent URL addresses. As a result, our server responds with a 404 HTTP response code. In this description, we will look at how to ban the large number of attempts resulting in 404 and other 4xx HTTP response codes using Fail2Ban.

Monit is a free and open source process and resource monitoring tool that can be used to monitor system processes and resources using a web browser and command line. Monit automatically stops or restarts processes or services if, for example, they use too many resources or behave abnormally. It also sends email alerts about various events.
On this page, we install the Monit system monitor program on a Debian 10 (Buster) perfect server version 1.1, where it was not used before, and then set it up.

Our ISPConfig server handles our websites nicely, however, if we refer to the server's IP address or full hostname in the browser, we do not get the expected result, because in this case the Apache2 Debian Default Page is loaded, which is essentially Apache's "welcome" page. Of course, this is not a tragic mistake, but a beauty mistake. In this description, we will see how we can configure our Apache web server so that the website we want is loaded.