August 2019

The installation begins by downloading the OpenVPN software. The OpenVPN client application for Windows can be found on the OpenVPN download page. Choose the appropriate installation version for the Windows version. Note: OpenVPN needs administrative rights to be installed.

After installing OpenVPN, copy the .ovpn file to:

C:\ProgramFiles\OpenVPN\config

When you launch OpenVPN, you will automatically see the profile and make it available.

OpenVPN must be run as administrator every time it is used, even by accounts set by default as administrative. To do this, without having to right-click and select Run as administrator each time you use VPN, you can preset this action,… read more +

The installation begins by opening the Google Play Store. Find and install Android OpenVPN Connect, the official Android OpenVPN application.

The .ovpn profile can be transferred by connecting your Android device to your computer using USB and copying the file over. Alternatively,

if you have an SD card reader, you can remove the SD device, copy the file on it, and then insert the card into the Android device. Launch the OpenVPN application and tap the menu to import the profile.
Then navigate to the saved profile location and save the file. The application will make a note that the profile has been… read more +

Even though CentOS is not a popular OS perfectly suitable for a desktop environment, at least not for the majority of people, it is still used in combination with Nvidia GPU for video editing, visualization, artificial intelligence, and cryptocurrency mining. If you intend on using CentOS as a desktop workstation, we recommend Fedora as a suitable and more flexible OS.

Before we start the procedure, we need to update our CentOS 7 1810 desktop to the latest version:

sudo yum update

sudo yum upgrade

By using the latest version of the Linux kernel but also have a list of the latest software on… read more +

OpenVPN is a VPN implementation for both client and server for Linux/Windows/Mac. To use OpenVPN, it is necessary to have an OpenVPN server in the target network, either the gateway or a dedicated “DMZ” (with publicly available IP and connected to the internal network). The client software must be installed, and the server address, port, encryption key, etc. must be configured.

OpenVPN can work on a server with TCP/IP routing ie, “tun” interface or bridge to LAN ie, “tap” interface. In the case of the “tun” interface, firewall rules must be configured for the “tun +” interface, in the case… read more +

The buttons on the toolbar correspond to commands, just like the items in a menu. In general, the toolbar buttons are duplicated for menu commands (shortcuts). The toolbar can be added with the AppWizard.

AppWizard creates the toolbar for the most used commands in File, Edit and Help. It is our responsibility to modify the toolbar as we wish.

Each button on the toolbar has an ID that identifies it. Based on this ID we will attach a button command.

Deleting the buttons on the toolbar

Next we will exemplify based on an application, called Tool, with a Document/View and MDI architecture. AppWizard… read more +

For creating an application we use AppWizzard. First of all here we are working with projects. A project can contain several applications.
To create a project we will use the File-> New-> Projects commands. From the list presented on the Projects tab (tab) we select the MFC AppWizard (EXE), select the location where it will be stored on the HDD, and then fill in the project name. After this we will have to complete a series of information grouped in stages.

Step 1. Application type

In step 1 we will select the type of application (choose the user interface). We have the… read more +

On the topic of securing a VPS server we will introduce you a tutorial to create a firewall using Iptables. As a tutorial operating system I chose CentOS.

What is a firewall?

In computer networks, a firewall is a device or set of devices configured to filter, encrypt or mediate traffic between different security domains based on predefined rules.

Supposing that you need to configure the port 80 required for a web server and SSH port, for security reasons, it is advisable not to use port 22 for SSH but any other port, for example, we will use 22222 for the tutorial…. read more +