Yesssssss !!!!!!!!!!!!! Thank you dalchina !

I have restored advanced settings as you proposed and the miracle happened.

Realized earlier that IPv4 was not allowed and tried to switch it...

I did check those, and nothing found. Seems normal to me.

On the other hand, it has been found in the meanwhile, that cmd -> ipconfig /all shows this status :
"Autoconfiguration IPv4 Address....

O.K. The trouble is, that ZAM download page is not accessible either, at least on this on this laptop, so I can't install that virus buster either.

Also : Miscroft's website and many of its...

I thought I had, but when I attempted recently to access that previous restore point, I found it disappeared in the haze. No idea, how come.

Edit: ... certainly it must be competely different...

Nope. There is no differencce whether or not I use Safe Mode with Networking .

The network adapters have already been reset, but no success.

The integrated Windows antivirus software did not...

Hi Callender,

As I wrote yesterday in my feedback, I performed those steps in #15, but no improvement is experienced.

I tried all suggestions proposed in this thread, but nothing has helped...

mS dEFENDER DEFAULT wINDOWS VIRUS PROTECTION AND FIREWALL IS INSTALLED, EXCLUSIVELY.

Can you explain what to look for in its settings ?

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Also, in the meantime I have...

@ #14:

The website suggested above - " server3. kproxy. com " demonstrates the same problematic behaviour as in the original problem statement above.

Though I am able to have access to that...

Yes, I did clear.

It's for sure, that all websites which get blocked display the same message: "Your connection to this site isn't secure. This site does not have a certificate" ( see screen...

From my " Admin local " account same problem persists.

Certificates are completely unknown to me.

After browsing through the cloudfare website my first understanding is, that such...

OK. Now I 'll try to access the internet from a freshly created new user account.

In the meantime let me ask: may a certificate problem ( SSL/TLS ) stand in the background ?

This is to confirm, that no VPN, no proxy server is configured on this computer.

- - - Updated - - -

Thanks dalchina, just checked the internet settings. My settings have been identical with...

Thank you dalchina,

Just read the content of the proposed link. These steps have already been performed by me. No improvement experienced in result.

Additional findings :

Checked the DNS...

Windows version related : Windows 10 Home, Version 22H2 - build nr: 19045.4291

Hardware: Dell Latitude E6540 laptop

Please help me find out how to rectify the faulty operation as desbribed...