New version is blocking Windows 11 Miracast Screen Sharing to TV

are you using Windows Admin user account?

Yes, of course.

Yeah, just confirmed to access Norton 360 ā†’ Settings from Standard user account. Ya need to Sign In as Admin.
So, ignore my question = are you using Windows Admin user account?

I donā€™t know what youā€™re trying to say. I am logged into Windows using an Admin account, yes. What else?

I canā€™t even change this setting from Smart Mode to Ask, for example:

Iā€™m trying to sayā€¦ignore my comment re Admin user account. Norton 360 v22 ā†’ changes to Settings was limited to Admin user account.
Norton v24 appears to allow access to Settings from Standard user account with Sign In to Admin user.

IDK why your Settings are not working.
Were my machine. Iā€™d Sign out / Sign in Nortonā€¦as test.
and Restart (not Shut down) machineā€¦as test.

No difference.
No difference.

  1. Reset to Default
  2. Repair Norton

  1. Norton 360 ā†’ clean install
    Norton_360_Remover https://www.norton.com/nortonremover

  1. contact Norton support
    ~ this process [here] works for me to reach: Live Agent
    Norton support via Social Support | Chat | Phone [here]
  1. Done. No difference.

  2. Done. No difference.

  3. Done. No difference. (Although I did notice that during the time when Norton was uninstalled, the problems Iā€™ve been having recently with my mouse severely lagging when I launch Firefox suddenly went away. All this time Iā€™ve been thinking that was a Firefox issue or a Windows 11 24H2 issue, and it was actually a Norton issue.) (Also while Norton was uninstalled, the program that Norton had been blocking worked fine, of course.)

  4. Done. Useless. The brain-dead chat agent wasted 25 minutes of my time doing absolutely nothing, until he finally made a suggestion that I add the program that is being blocked the the virus scan exclusion list. Apparently the agent doesnā€™t know the difference between virus scan and firewall. (I also tried phone support. I was on hold for 40 minutes ā€“ of the promised ā€œ5-minute estimated wait timeā€ ā€“ before I hung up.)

Is there a way to revert to an older version of Norton, that didnā€™t have this issue?

For now, Iā€™m giving up and disabling Smart Firewall. Iā€™ll rely on Windows Firewall, plus Norton Anti-Virus. (Will Norton give me half my money back since theyā€™ve made half their program unusable? No, I know they wonā€™t.)

To add insult to injury, now I canā€™t even activate the reinstalled Norton 360. I keep getting this error message when I enter my valid login credentials:

Is there nothing this company can do right?

Revert to version 22.24.8.36 [here] & [here] & [here]

I should have specified: Is there a way to revert to an older version of Norton, without downloading software from sketchy unofficial websites?

what websites are sketchy unofficial?

Use this direct download link for the installer -
https://buy-download.norton.com/downloads/2024/22.24.8/N360/US/N360-ESD-22.24.8.36-EN.exe

File: N360-ESD-22.24.8.36-EN.exe
File size: 234 MB (245,422,936 bytes)
MD5 checksum: CEB2C4D386AC0B4C8D1D65D758EC3564
SHA256 checksum: 7787C59D5DAEBE6B08DF6076867ABF242E9414BB11716169489666EB72BD7DEE
Date/Time: 2/2/2025
VirusTotal report here

I used Wireshark to track

  • Cast Win 11 to TV
    • working (NORTON Firewall OFF) vs
    • not working (NORTON Firewall ON).
      There were clear differences in the network traffic.

Working case

  • see IGMPv3 protocol messages

NOT working case

  • no IGMPv3 protocol messages

I could not find any NORTON 360 Firewall documentation relating to IGMPv3.

Maybe somebody at NORTON could take a look at this.

I did this, and my Public enetwork exceptions screen now has both Public and Private networks enabled to Allow IGMP traffic. But ā€¦ no joy!; still doesnā€™t work!

To the Norton Support Team: WTF! This has been dragging on for months, and I actually spent 1 hour with a support person ā€“ given him remote access to my computer ā€“ but after 1 hour of poking around at seemingly random (to me) options it still wouldnā€™t work. Since this is trivial to replicate, what kind of a software business are you guys running there??? This is not a ā€œsubtleā€ difficult-to-replicate issue. Your crap just no longer works as it did before. So you wonā€™t fix it or you canā€™t fix it (layed off everyone who actually knows how your sotware works)?

In Norton 365 I did
Home ā†’ Settings ā†’ Troubleshooting ā†’ Reset to default ā†’ Yes, reset

Canā€™t be sure what this changed for me.
Cast to TV now works with Norton Smart Firewall ON.

I did notice in Smart Firewall traffic rules there are

  • two entries re MULTICAST
  • I am not sure if these were both there before I did the reset.

Be aware the reset will remove any settings you have made.