Lu Wei wrote:

For a long time MSFN's Windows XP forum
(https://msfn.org/board/forum/34-windows-xp/ ) is my source of
information about XP. But recently I hardly could open it. Is it only
me? Is there anything wrong with the site?

I can load it in Firefox 79.0, latest release, while on Windows 10. The
last version of Firefox that is usable on Windows XP in version 52ESR.

You obviously don't get to use Edge (old EdgeHTML or new Chromium
versions) on Windows XP.

I can load it in Google Chrome 84.0.4147.125, latest release, again
while on Windows 10.

Don't know what "hardly can open it" means. Many sites require a
minimum version of the web client used to connect to their site. There
are features or functions available only in later versions. Many sites
will not accept connects from Internet Explorer whose last release was
almost 7 years ago. You never mentioned which web browser you were
using and its version.

You also did not mention if you installed any extensions in the
unidentified web browser. Those can affect rendering or even connecting
to a web site or the resources it uses from elsewhere.

What web browser?
What extensions installed into it?
What anti-virus or other security software?
What does "hardly open it" mean?