Hello Thank you for your question and reaching out.
- Disable any Antivirus program or Windows firewall you may have for temporary purpose.
- Disable ipv6 from TCP/IP settings of Network card. also Gateway should be of your Router ip address.
- Reboot your Router or Internet Device
- Disable any VPN service and Proxy from browser.
- Disable any add-ons or plugins from your browser. also try to access websites from different Browser using Incognito or In-Private mode. --If the reply is helpful, please Upvote and Accept as answer--