Thank You ESET team. Whatever you did finally fixed the issue with Chromecast not working.
Today is the first time in almost a month that I can view movies from my browser again. I'm so happy, as I felt uncomfortable trying to do those things about changing those HTTPS Ports and all.
So once again, Thank you Very Much.
Internet Protection Module #1375 is rolled out on the pre-release update channel, and it works fine for me with the default Eset settings. There is no more need of whitelisting port 8009. Hopefully it will be rolled out soon on the regular update channel as well.
I truly hope the bugfix will come soon. However you really do not need to wait for that. Do the following step by step:
01. Open Eset console | 02. Click "Setup" | 03. Click "Advanced setup" | 04. Click "Web and email" | 05. Click " Web access protection" | 06. click "Web protocols" | 07. Now you are on the right place | 08. Focus on "Ports used by HTTPS protocol" | 09. You have to see the text "443, 0-65535" in the input field. | 10. Replace the text with "443, 0-8008, 8010-65535" (of course, without quotes) (you can copy-paste) | 11. Press "OK" | 12. If Windows asks for permission, press "Yes" | 13. Close ALL instances of Chrome | 14. Reopen Chrome | 15. Connect to your Chromecast | 16. Success!
After the bugfix will have been rolled out, you can reset the original text you modified.