Return to protonvpn.com Facebook   Twitter   Reddit   Instagram   Mastodon   ProtonMail

Troubleshooting and general information


 

Allowing sessionStorage

ProtonVPN uses the latest in web technologies to secure your data, and requires sessionStorage. This article will explain what sessionStorage is and address common issues. What is sessionStorage? sessionStorage is a new web technology that lets you store website information securely on your device. We use sessionStorage to store your authentication token which is […]

 

How to enable the base filtering engine

If the base filtering engine (BFE) is not running on your Windows device, the ProtonVPN app will show the following error messages: The most likely reason the BFE is not running is that a virus disabled it to perform malicious actions on your device. For ProtonVPN to work properly, you […]

 

Issue with mobile data usage on iOS 14 with ProtonVPN

We have been contacted by users reporting that their iPhone is telling them that they are using unexpectedly large amounts of data when using their mobile data plan while connected to ProtonVPN. We have found that the cause of this unexpected data use is an accounting issue with iOS 14. […]

 

Solutions to ProtonVPN Android app issues

VPN Connection fails due to an authentication failure Symptom: Opening and logging in to the ProtonVPN Android app is successful. However, when you try to connect to a server, the connection fails and returns the error message “User authentication failed”. The Android application logs indicate “AUTH_FAILED”. (You can access your […]

 


Don't find your answer? We're happy to help you!     Contact Our Support Team

Secure your internet

Get ProtonVPN

For customer support inquiries, please submit the following form for the fastest response:
https://protonvpn.com/support-form

For all other inquiries:
contact@protonvpn.com

You can also Tweet to us:
@ProtonVPN