Starting with about 24.01.2022, I experience troubles with updating OS.
Previously there were troubles with getting files with repository description,
such as
https://download.opensuse.org/repositories/multimedia:/libs/openSUSE_Leap_15.3/repodata/40b1774cac13e48d14fd395495274ca8198f54ff3c0bdca981cf184fd8c87e1a-primary.xml.gz.

Today I cannot get updates at all:

"Error with loading" (curl)
"https://download.opensuse.org/repositories/utilities/openSUSE_Leap_15.3/noarch/urlscan-0.9.7-lp153.23.2.noarch.rpm":
"Error code": Connection failed
"Error message": Could not resolve host: mirrorcache-eu.opensuse.org

I am using https instead of http, that means using "mirrorcache.opensuse.org".
Trying to change https to http for Packman with YaST: unable to do this.
I can download files with Firefox, but during update system cannot see them.


Reports during getting update description files:

1.
https://download.opensuse.org/update/leap/15.3/sle/

"Error with loading" (curl)
"https://download.opensuse.org/update/leap/15.3/sle/repodata/repomd.xml":
"Error code": Connection failed
"Error message": Could not resolve host: mirrorcache.opensuse.org

2.
https://repo.vivaldi.com/archive/rpm/x86_64/

"Error with loading" (curl)
"https://repo.vivaldi.com/archive/rpm/x86_64/repodata/repomd.xml":
"Error code": Connection failed
"Error message": Could not resolve host: repo.vivaldi.com

3.
https://ftp.gwdg.de/pub/linux/misc/packman/suse/openSUSE_Leap_15.3/

������������������������������������ ������������������������������������������������ (curl)
"https://ftp.gwdg.de/pub/linux/misc/packman/suse/openSUSE_Leap_15.3/repodata/repomd.xml":
������������������ ������������������������������������: Connection failed
������������������������������������������������������ ������������ ������������������������������������: Could not resolve host: ftp.gwdg.de