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[Solved] Not Acceptable! An appropriate representation of the requested resource could not be found on this server. This error was generated by Mod_Security.

Today when I requested to access my WordPress website through the program, the server returned the following warning message:

Not Acceptable!
An appropriate representation of the requested resource could not be found on this server. This error was generated by Mod_Security.


According to the message, we can assume that this error may be in the following two situations:

  • Server cannot find the format we request, so ti cannot accept the request
  • Server Mod_Security seen the request as a malicious attack

At present, after trying, there should be 3 solutions:

  • Clear Cookie/Cache (This problem occurs when only web browsing)
  • Add user-agent and content-type
  • Edit the .htaccess file (make sure you can recover)

Solutions

Method 1: Clear Cookie/Cache

One type of blocking is that when you repeatedly enter the wrong account and password, the server-side security protection determined that the browser/IP address you are used is the source of malicious attacks, and block the requests.

In this case, you can try to clear the cookie/cache of the browser and try the request again.


Method 2: Add user-agent and content-type

  • user-agent is a field that confirm client information, such as the browser version and operating system, as well as fields that may be confirm during anti-crawlers
  • content-type is a resource request format, it allow the server to know the format we want to request.


Method 2: Edit .htaccess file (make sure you can recover)

Remind again: Please confirm that you can restore the original content of the file.

To put it simply, in the .htaccess file, set Mod_Security to not enable.

<IfModule mod_security.c>
  SecFilterEngine Off
  SecFilterScanPOST Off
</IfModule>

References

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