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I can see that the website is loading fine now. Could you please let me know if you’re using CloudFlare as well? If the issue happens again you can try temporary disabling it and test again. I will recommend you to check the Apache error logs in order to track down what happened.
I have the same error from time to time, I don’t know why this happened, I am using Cloudflare and my server use Nginx, and I didn’t find any error in Nginx logs file !!!
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