Follow-up Comment #4, sr #110546 (project administration): It seems to be a client-side problem, per https://docs.certifytheweb.com/docs/kb/kb-202109-letsencrypt/ which says "If your site is working for most devices but not for some, the problem is with their trust store".
Nonetheless, maybe a hint could be given in https://savannah.gnu.org/maintenance/SavannahTLSInfo/ or https://savannah.gnu.org/tls/ ? _______________________________________________________ Reply to this item at: <https://savannah.nongnu.org/support/?110546> _______________________________________________ Message sent via Savannah https://savannah.nongnu.org/
