Sorry for putting this rather techincal problem in codeforces but I didn't find any other place to post it on. I am having problem connecting to codeforces via a browser and I am getting the message 'This site can’t be reached'. This problem appears in a very strange manner that I don't get it for some days I do nothing special it disappears itself and after a few days again I can't connect without doing anything specific :( . Another strange situation is that it is completely fine using python request.get('https://codeforces.com') and I am getting response 200. I have tried the browsers google chrome and microsoft edge and the result is same in both browsers.(It is always fine with a vpn connecting to almost all the countries. Any ideas why this strange situation is happening? (I can't compete in contest well because it will make the internet speed extremely small). Thanks!