Chosen Solution

I check if the problem is present on a different computer , and from the same router machine. And there is no problem. So the router is not blocked. It must be an IP related blockage. Thank you. Also… I suspected maybe is a special dedicated virus for blocking a website on a specific IP? I scanned my computer with an AV (antivirus) Malwarebytes and nothing is found.

Hello nice to meet you, have you tried clearing your browser’s cache and cookies? Sometimes your browser will store old code and try to re-use it when requesting a website you have been to before. Make sure to clear all of the cache, including: history, cookies, and cached images and files. Make sure you clear the whole history and not just the last 7 days. Hope this helps, talk to you soon