openSUSE admin

Dear admin/all,

these commands used to work just fine on an internal system with no initial repos a
couple of days ago:

--- snip ---
zypper ar http://download.opensuse.org/distribution/leap/42.3/repo/oss/ repo
zypper ar http://download.opensuse.org/update/leap/42.3/oss/ repo-update
zypper ref
--- snap ---

As of today I get:

--- snip ---
box:~ # export LANG=C

box:~ # rpm -q gpg-pubkey
gpg-pubkey-3dbdc284-53674dd4
gpg-pubkey-0e203798-552e5058

box:~ # zypper lr
Warning: No repositories defined.
Use the 'zypper addrepo' command to add one or more repositories.

box:~ # zypper ar http://download.opensuse.org/distribution/leap/42.3/repo/oss/ repo
Adding repository 'repo' ..............................[done]
Repository 'repo' successfully added

URI : http://download.opensuse.org/distribution/leap/42.3/repo/oss/
Enabled : Yes
GPG Check : Yes
Autorefresh : No

Repository priorities are without effect. All enabled repositories share the same
priority.

box:~ # zypper ar http://download.opensuse.org/update/leap/42.3/oss/ repo-update
Adding repository 'repo-update' ........................[done]
Repository 'repo-update' successfully added

URI : http://download.opensuse.org/update/leap/42.3/oss/
Enabled : Yes
GPG Check : Yes
Autorefresh : No

Repository priorities are without effect. All enabled repositories share the same
priority.
box:~ # zypper ref
Retrieving repository 'repo' metadata -------------------[|]
Download (curl) error for
'http://download.opensuse.org/distribution/leap/42.3/repo/oss/gpg-pubkey-307e3d54-4be01a65.asc':
Error code: Curl error 60
Error message: SSL certificate problem: self signed certificate in certificate chain

Abort, retry, ignore? a/r/i/...? shows all options:
--- snap ---

I know that 42.3 has reached EOL, but there still a few systems where we have to used
it for dependency reasons.

Do you have any idea what's going on?

Thanks and regards -- Till¶

Dipl.-Inform. Till Dörges doerges@pre-sense.de
PRESENSE Technologies GmbH Nagelsweg 41, D-20097 HH
Geschäftsführer/Managing Directors AG Hamburg, HRB 107844
Till Dörges, Jürgen Sander USt-IdNr.: DE263765024