Incident Summary – Proton VPN VPN Servers Authentication Outage
Date & Time: 7:30 CEST – 10:30 CEST (2025‑09‑10)
Impact: A subset of users experienced connection failures when connecting to Proton VPN servers. The issue prevented new sessions from being established.
Root Cause: During a scheduled update to tighten our authentication policies, a manual configuration change was applied incorrectly. The erroneous setting unintentionally blocked valid credentials for a portion of the user base.
Resolution: Once the misconfiguration was identified, the affected settings were rolled back and the authentication service was restored. All systems returned to normal operation by 10:30 CEST, and users were able to reconnect.
Status: The incident is now closed. Services are fully operational, and no further impact is expected.