504 error from Iranian IP

Hi there, in my website, Iranian Users can’t access to website and they get 504 error.

This problem was happend in last 24hrs.

when I changed DNS to my server dns, the problem get solved and users told that they can use website.

what should i do to solve this problem ?

by the way, i used search box and there is no answer for my question.

the problem is happened in last 24 hrs and every thing was ok before. I’m not using https.

website address is: taroot-rangi.com

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