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HTTP 406 Not Acceptable Error

 Recently, my websites suddenly started showing the HTTP 406 – Not Acceptable error. This issue appeared without any changes made on my end, which made it a bit confusing at first.

Initial Troubleshooting

After searching online, I found that many people suggested disabling the mod_security module, as it can sometimes block legitimate requests. I tried the recommended configurations to turn off mod_security, but unfortunately, that solution did not work for me.

Actual Cause & Solution

I then contacted my website’s hosting/server support team and explained the issue in detail. After checking their logs, they informed me that:

  • My requests were being blocked by server security rules

  • The affected requests were not whitelisted

  • They removed the blocking rule / added my requests to the whitelist

Once this was done, the websites started working normally again.

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