Proton SSL certificate status
Valid — 72 days until expiry(proton.me)
This page shows the Proton SSL certificate as served by proton.me, read from a live TLS handshake by an independent CertPost probe and rechecked hourly: expiry, issuer, hostname coverage, the full chain, and the negotiated protocol.
Last checked 2026-09-20 07:46 UTC. CertPost is not affiliated with Proton.
Certificate details
Hostnames this certificate covers
*.pr.tn, *.proton.me, *.storage.proton.me, pr.tn, proton.me
Certificate chain as served
Common questions
Is the Proton SSL certificate expired?
At the last check, the certificate proton.me serves was within its validity period. It expires on 2026-12-01, 72 days from that check.
When does the Proton SSL certificate expire?
The certificate proton.me is currently serving expires on 2026-12-01 (72 days from the last check). Large services rotate certificates long before that date.
Who issued the Proton SSL certificate?
The certificate was issued by YR2.
How is this checked?
A CertPost probe opens a real TLS connection to proton.me on port 443 and reads the certificate the server presents, the same way a browser does. The result is cached and refreshed hourly.
Proton rotates certificates without downtime. Your own domains are the ones that expire quietly — watch 3 free, no card.
Monitor your certificatesOr run a one-off check with the free SSL checker.