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I have been having the same problem. There is a bunch of solutions here: https://forums.opera.com/topic/48786/err_empty_response-on-auth-opera-com
None of them worked for me but maybe you have more luck.
What actually worked for me was disabling Web Protection on NordVPN. If you are using a VPN or antivirus with the same functionality, disabling it may work.
I have been having the same problem. There is a bunch of solutions here: https://forums.opera.com/topic/48786/err_empty_response-on-auth-opera-com
None of them worked for me but maybe you have more luck.
What actually worked for me was disabling Web Protection on NordVPN. If you are using a VPN or antivirus with the same functionality, disabling it may work.