How to setup the PPTP client in Windows 7 and later

In this article, I will guide you through the process of setup of the PPTP client in Windows 7 and later OS. This tutorial also covers the Windows server platform. The client side setup does not depends on the type of VPN server.

Thanks to the Mikrotik RouterOS and similar platforms, setup for this kind of tunnel is very simple today. Moreover, this tutorial is the client-side part of our PPTP series. You can find here the detailed explanation of the server side setup.

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How to integrate your Mikrotik router with Windows AD

Whether you need to authenticate your users for PPP or any other Mikrotik service, you can do that either through the internal database or using the external RADIUS server. On the other hand, your corporate users want to use one login for all network services.

Additionally, you can connect any Mikrotik device with your Windows AD.

Let’s make the magic!

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Using PPTP VPN on the Mikrotik router

The PPTP protocol was developed by a group of vendors during the late 1990s. It’s still very popular, although it contains many security issues. The part of its popularity lays in the simplicity of the implementation and the built-in support in virtually every operating system.

The specification for PPTP was published in RFC2637. This type of VPN is well known for implementing on the Microsoft Windows platforms. Additionally, many other vendors implemented (at the very least) the client version and the server part is implemented in Mikrotik RouterOS, too.

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Your MikroTik router may be compromised

I had a few phone calls from my friends during the past few days related to the new hacker attack on the Mikrotik routers. The unknown file named mikrotik.php appears between the files and you have a new script named script3_. Even more, your firewall is disabled.

This attack exploits vulnerabilities in the Web service. Although this blog claims that this vulnerability is fixed in the RouterOS version 6.38.5, I found that many routers that are not updated to the latest version are infected. A few of mine routers with the RouterOS versions 6.38.5, 6.39.x, 6.40.x or even 6.42.3 were attacked. Continue reading

Duplicate V3 extension in a X.509 certificate

Recently, I got a report that one application can’t connect to the Exchange server. The error message was:

Exchange server error: The request failed. javax.net.ssl.SSLProtocolException: java.io.IOException: Duplicate extensions not allowed.

The first Google search revealed to me that this error message is related to the error inside the SSL certificate and the java based library can’t override such situation. Continue reading

Trojan on my Android tablet after the factory data reset

At the end of 2017 I decided to reset my Android tablet. I used it as an auxiliary on-field device. There was no important data on it, but it could do with a clear down, a fresh start. The factory reset is a very easy task on Android devices.

I ran the reset task, it restored my device to a clean state and everything looked fine. I spotted McAfee anti-virus on it and ran it just for fun. It updated itself, started the scanning process and alerted me of the threat. I had a Trojan virus on the factory reset device.

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