How to: Clear DNS cache on all kind of systems

Every few weeks I stumble across the same issue again: “How could the DNS cache be cleared again?” I admit, clearing DNS cache is not a daily task, but when it comes to it, you usually forgot the commands. That’s why the following is a short tutorial on how to empty the DNS cache in various operating systems and browsers.
Before we get to the individual solutions, I’d like to quickly explain what the DNS cache is for in the first place and when you should flush it (that’s the English term).
What is the DNS cache and when should you clear it?
The Domain Name System (DNS) is an essential service within IP-based networks, such as the Internet. If a user makes a request to a server via a program and uses a domain such as “code-bude.net”, the program first makes a request to a name server, which then determines the corresponding […]

Restore unsaved documents in Word

How to recover word documentsI think almost everyone knows the scenario: You work on a Word document and either Word itself or the entire computer crashes. In order to prevent a total loss of the document, Word can activate the so-called “auto save” function, which saves the document automatically every X minutes. So in a crash only the changes since the last automatic save are lost.
But what if you had not saved the document yet? In this case, Word does not automatically restore the document. But here, too, is one last salvation. We want to look at both tips in the following.
Enable automatic saving in Word
First, the automatic save should be activated. If this is active, you can even recover documents that have not yet been saved. (Say: Word […]

Change Logitech FN-key behaviour without software

Change standard FN-key behaviourToday there is once again a short tip – this time for all owners of Logitech keyboards with a FN-key. Some time ago I was looking for a new keyboard. Criterion: Parallel usage of several devices – usually via Bluetooth. In the end the choice fell on the Logitech K375s. Stylish design, support for up to 3 devices that can be connected via Bluetooth or Logitech Unifying receiver. Only one small problem remained: the FN key.
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By pressing the FN key, the second assignment of individual keys can be activated. For example: You can control the volume by pressing the F12 key while holding down the FN key. So that’s the way I would prefer it at least. In practice, the FN key is active […]

How to read, calculate and set MTU in Windows, Linux and OSX

After I released the MTU Optimizer, a small tool for determining the optimal MTU, some days ago, let’s look at how to determine the optimal MTU by hand, how to read the currently set MTU and how to set new MTU value now. Of course we will discuss the whole thing for the three major operating systems: Windows, OSX and Linux.
Before we look at the implementation within the individual operating systems, we first briefly clarify what the MTU is and how its optimal value can be calculated.
Theory – Identify ideal MTU
The MTU (Maximum Transfer Unit) describes the maximum packet size of a protocol. It therefore indicates the maximum size of a data packet, so that it can be transmitted via a protocol. If a data packet is larger, it becomes fragmented – i.e. divided into several packages.
For example, let’s assume that we (=PC) would have a factory for sugar packets and our packet […]

Windows 10: Fix wrong time

Fix-Win-10-wrong-time-problemFor some time, I was plagued by a small, but not less annoying, issue on Windows 10. The system time drifted intermittently one hour off. A manual changeover of the time brought success only in the short term. After a while the clock went wrong again.
The correct time zone and summer/winter time (daylight saving time) were selected in the Windows time and date settings and the automatic synchronization of the time was activated. Nevertheless the Windows clock did what it wants, but not what it was supposed to do.
Finally I found the solution to the problem inside the Windows services menu. The automatic time synchronization service was disabled. Now, after I activated the Windows Time service, the system time is correct again. You can activate the service as follows.

Press Win-Taste + R key
Enter services.msc and click ok, […]