Protecting Microsoft VPN (RRAS) from Brute-Force Attacks. How to stop brute-force on Microsoft VPN Server.

Protecting MS VPN (RRAS) from Brute-Force Attacks

In today's digital landscape, where remote work has become the norm, securing your network's remote access is more critical than ever.

If you're utilizing Windows Server's Routing and Remote Access Service (RRAS) for VPN connectivity, you may find that your System event log is flooded with Event ID 20271 records like below:

Failed RRAS/VPN entries in the System event log

Failed logon entries in the System event log

The user admin connected from 185.16.39.179 but failed an authentication attempt due to the following reason: The connection was prevented because of a policy configured on your RAS/VPN server. Specifically, the authentication method used by the server to verify your username and password may not match the authentication method configured in your connection profile. Please contact the Administrator of the RAS server and notify them of this error.

The user vpn connected from 68.69.184.82 but failed an authentication attempt due to the following reason: The remote connection was denied because the user name and password combination you provided is not recognized, or the selected authentication protocol is not permitted on the remote access server.

These records may indicate brute-force attacks on your server to find weak passwords. In most cases, these attacks are performed using automated tools widely available on the Internet.

When performed from a powerful machine with a good internet connection, these attacks may affect your web-server availability, consuming bandwidth, processor time, and memory usage.

With RdpGuard, you can effectively stop these brute-force attempts on your RRAS server. RdpGuard monitors the system event logs for failed login attempts to the RRAS and blocks offending IP addresses immediately.

For Windows Vista/7/8/8.1/10/11 and Windows Server 2008/2012/2016/2019/2022

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Protecting MS VPN (RRAS) from Brute-Force Attacks

To Enable MS VPN (RRAS) Protection