Win11 Pro suddenly unable to connect to internet

My Win11 Pro desktop system suddenly became unable to connect to the internet.. This happened after I powered down from a normal online session and then powered back on several hours later. The system is up to date and recently passed an SFC run with no problems. Things I've tried with no luck:
1. Verified that my router was OK and allowed my Win11 Home laptop to connect OK using both WiFi and Ethernet cable
2. Switched Ethernet cable from laptop to desktop - no help
3. Switched desktop from Ethernet to WiFi - no help
4. Ran sfc /scannow - it made some corrections, but no change after reboot

I figured an Inplace Update would be a good idea, but stopped when I realized I'd have to use my laptop to download the ISO file, and laptop runs Win11 Home. The wording on the ISO download screen suggested it would be the same version as currently running on the laptop. So I did not get the ISO.

Am I in one of those Catch-22 situations where you need a broken machine to fix itself, but the thing that's broke is what you need to get the fix? Or am I missing something simple?

Try this, Reset Network Adapters in Windows 11
and this
Open command prompt as administrator and type the following commands
netsh int ip reset
netsh winsock reset
ipconfig /release
ipconfig /renew

then restart.

please open control panel > network & sharing centre
on the left side 'change adaptor settings'

right click your network connection
WiFi and/or Ethernet
and on the right click menu
there is 'diagnose'

please try that as a first step.
best of luck Steve ..

If the above does not work try @FreeBooter batch file .Run as admin

Thanks for all the very timely replies - i do appreciate everyone's attention and timeliness.

For some reason unknown to me my problem just suddenly disappeared. As if by magic. And yes, I do understand that there is no such thing as magic.

What happened was that after posting my initial message I went on to do some other stuff using my laptop. It was running on a spare Cat5 cable I keep connected to my router just for situations like this. So I unplugged the cable (the same one that had failed to allow my Win11 Pro system to connect) and put the laptop back on WiFi. That worked fine so I figured I continue with that while I waited for some answers here.

Then I went back to the desktop and plugged it's normal Cat5 cable back in, figuring I just shut it down for a while and stick with the laptop. But when the cable went back in I noticed that the desktop was back online. Why I have no idea - after I ran the SFC /scannow i mentioned above I did do a reboot, so it wasn't that.

Gremlins? Spooks? Bad luck? Stray alpha particles?

Any way - happy Thanksgiving. Gobble gobble.