How to block those requests?

Corobori 26 Reputation points
2021-07-09T02:57:15.57+00:00

One of my website is being under attack. I am getting requests, as shown below, from several IPs addresses. Is there a way to block them ?

113193-block.jpg

Internet Information Services
ASP.NET Core
ASP.NET Core
A set of technologies in the .NET Framework for building web applications and XML web services.
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  1. JasonPan - MSFT 1,306 Reputation points Microsoft Vendor
    2021-07-09T05:59:17.04+00:00

    Hi @Corobori-9276

    You can configure ipv4 address restrictions for remote connections.

    Official doc :

    Configure IPv4 Address Restrictions for Remote Connections (IIS 7)

    Configure IPv4 address restrictions to specify whether a specific IPv4 address or range of IPv4 addresses are allowed or denied permission to connect remotely to sites or applications on the Web server.

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    Best Regards,
    Jason

  2. Corobori 26 Reputation points
    2021-07-09T14:09:16.38+00:00

    @JasonPan - MSFT Blocking at IP address level was not doable as requests were coming from varios IP address from different countries (Russia, Mexico an Brazil)

    Eventually I decided to filter thru IIS using the following rule but it doesn't seem to work as expected.

    When using this rule

    <filteringRule name="TESTRULE" scanUrl="true" scanQueryString="true">
    <appliesTo>
    <clear />
    </appliesTo>
    <denyStrings>
    <clear />
    <add string="BLOCKINGWORD" />
    </denyStrings>
    <scanHeaders>
    <clear />
    </scanHeaders>
    </filteringRule>

    My website gives me what is shown below. I was expecting a 404 page not found, according to what I read.

    113404-2021-07-09-11-10-27.jpg