ERR_CERT_COMMON_NAME_INVALID
ERR_CERT_COMMON_NAME_INVALID: understand and fix the error
  • Technical matters

ERR_CERT_COMMON_NAME_INVALID is an error message shown by Chrome when there are problems with a website’s security certificate. This error message prevents you from accidentally visiting an unsafe website and it keeps visitors safe from third parties trying to steal their data. Here is how to fix the error with different methods.

ERR_CERT_COMMON_NAME_INVALID: understand and fix the error
Goodbye email to coworkers
Goodbye email to coworkers and customers: Templates and tips
  • E-mail marketing

With your goodbye email to coworkers and customers, you can demonstrate professionalism, show your sense of humor, and leave a good impression. Read our tips on choosing the appropriate tone, recipients, and timing for your message, and learn what you should and shouldn’t say in a goodbye email. Use our sample emails for inspiration when it’s time to you write your own farewell email to coworkers....

Goodbye email to coworkers and customers: Templates and tips
Provide Raspberry Pi with a static IP address
Equip Raspberry Pi with a static IP address
  • Configuration

Both the private Raspberry Pi IP address and the public IP address of the internet connection are constantly changing for most users. Such dynamic IP addresses aren’t practical for the use of a minicomputer. But if you want to use server software effectively on your Raspberry Pi, you need a static IP address for the computer in the local network. The internet access used to make the server...

Equip Raspberry Pi with a static IP address
Markdown editors
Markdown editors for Windows, Mac and Linux
  • Web development

How can you easily format texts for use online and offline? This becomes a piece of cake when you use the markup language Markdown and an editor. With these editors for Linux, Windows and Mac as well as the online editors, you can create Markdown documents and convert them into HTML pages. But what are the best Markdown editors?

Markdown editors for Windows, Mac and Linux
Task Manager Mac
How to open the Task Manager on Mac and monitor load
  • Configuration

As in Windows, there is a shortcut that opens the Apple Task Manager. However, unlike the Windows version, the Mac Task Manager only lets you close programs. It doesn’t show you CPU load or energy usage. If you want to check these stats, you need to access the Mac Activity Monitor instead.

How to open the Task Manager on Mac and monitor load
Linux shutdown command
Linux shutdown: commands for shutting down and restarting Linux
  • Configuration

Using Linux shutdown commands, Linux operating systems can easily be stopped, shut down, and restarted. In addition to being able to set up a Linux shutdown with a time delay, the shutdown command can also be used to turn off the system’s main power supply, set up a wall message or cancel a previously initiated shutdown.

Linux shutdown: commands for shutting down and restarting Linux
What does the '404 Not Found' error mean?
What 'Error 404' means and how to fix it
  • Website creation

How often have you stumbled upon a dead end while surfing the net? HTTP 404 error pages are commonplace online to inform users that the requested page isn’t available. As well as being annoying for visitors, they spell bad news for website owners since a dead link may have a bad influence on a website’s search engine ranking. In this article, we’ll demonstrate the importance of 404 pages and...

What 'Error 404' means and how to fix it
Markdown
Markdown: guida al semplice linguaggio di markup
  • Web development

Scrivere in Internet senza conoscere HTML? Si può fare, grazie a markdown. Questo semplice linguaggio di markup permette di formattare testi in CMS, forum o wiki, evitando tag complicati. La sintassi di markdown è fatta di caratteri semplici, per lo più intuitivi. Questi semplificano sia la lettura, sia la scrittura. Come funziona markdown?

Markdown: guida al semplice linguaggio di markup
Gmail dark mode
Enabling Gmail dark mode: easy steps
  • Technical matters

Gmail dark mode makes it possible to use Gmail with a dark user interface on your PC or smartphone. On the one hand, it looks classy, and on the other hand, it’s easy on the eyes and the battery due to the reduced display brightness. We’ll show you how to activate Gmail’s dark theme in our practical step-by-step guide.

Enabling Gmail dark mode: easy steps