system reconfigure, Git error: the SSL certificate is invalid

[Andreas Reuleaux <rx@a-rx.info>]

Hi,

In a slight variation of section 3.7 of the Guix Manual ("After System
Installation"), I regularly do 

  guix pull

as a regular user (rx in my case), and then (using rx's guix command),
as root:

# /home/rx/.config/guix/current/bin/guix system reconfigure /etc/config.scm

(i.e. instead of using sudo, as suggested in the manual)

This combo used to work fine for me for quite a while. Now, since a few days,
having done my 

  guix pull

step (as user rx), which still works fine for me (updates my guix system), I get an error when
trying the above reconfigure step:

    root@pc ~# /home/rx/.config/guix/current/bin/guix system reconfigure /etc/config.scm
    Backtrace:
    In ice-9/boot-9.scm:
      1731:15 19 (with-exception-handler #<procedure 7f5dc055ef30 at ic…> …)
    In guix/scripts/system.scm:
       1286:8 18 (_)
    In guix/status.scm:
        776:4 17 (call-with-status-report _ _)
    In guix/scripts/system.scm:
       1125:4 16 (_)
    In ice-9/boot-9.scm:
      1736:10 15 (with-exception-handler _ _ #:unwind? _ # _)
    In guix/store.scm:
       631:22 14 (thunk)
       1299:8 13 (call-with-build-handler #<procedure 7f5db7c4db70 at g…> …)
      2025:24 12 (run-with-store #<store-connection 256.99 7f5db7bd4c80> …)
    In guix/scripts/system.scm:
      1145:15 11 (_ _)
        783:4 10 (perform-action reconfigure #<<operating-system> kerne…> …)
    In guix/scripts/system/reconfigure.scm:
        323:2  9 (check-forward-update _)
    In srfi/srfi-1.scm:
       691:23  8 (filter-map #<procedure 7f5dc4094140 at guix/scripts…> . #)
    In guix/scripts/system/reconfigure.scm:
       330:37  7 (_ #<<channel> name: guix url: "https://git.savannah.gn…>)
    In guix/git.scm:
       329:29  6 (update-cached-checkout "https://git.savannah.gnu.org/…" …)
    In ice-9/boot-9.scm:
      1736:10  5 (with-exception-handler _ _ #:unwind? _ # _)
    In git/clone.scm:
         46:8  4 (_ _ _ _)
    In git/bindings.scm:
         77:2  3 (raise-git-error _)
    In ice-9/boot-9.scm:
      1669:16  2 (raise-exception _ #:continuable? _)
      1669:16  1 (raise-exception _ #:continuable? _)
      1669:16  0 (raise-exception _ #:continuable? _)

    ice-9/boot-9.scm:1669:16: In procedure raise-exception:
    Git error: the SSL certificate is invalid

    root@pc ~#


I have no clue - and I am fairly new to guix, and yet have many thing to learn - so bear with me, please -
I would prefer to make my next guix steps, however, having a working / up-to-date system. 

Thanks in advance.
  -A