Troubleshooting and general information

With the massively increasing amount of IP addresses required by the global network each year, IPv4 can no longer meet the demand. That’s why IPv6 was introduced — to allow more unique TCP/IP identifiers to be created for each user. While most of the internet uses the IPv4 protocol, there […]

VPN Connection fails due to an authentication failure Symptom: Opening and logging in to the Proton VPN 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 […]

  Peer-to-Peer is a network protocol for computer users that allows to search and download content. Because of the unique structure of the network, it is very efficient for downloading large files. On a Peer-to-Peer network, when a user is searching for a specific file, the installed software is locating […]

Once you create your account, we advise you to write down your password and keep it in a safe place. However, it’s natural that some people will forget or lose their passwords. In that case, you can reset your Proton VPN account password by using your recovery email address as […]

Is the Proton VPN Android app not automatically reestablishing a VPN connection when Always-On VPN is enabled? Here are the steps you can take to resolve this issue. This problem can occur on some devices because certain phones don’t allow Proton VPN to continue running in the background or use […]

Why do you need Cookies? Chrome If you’re using Chrome, go to Chrome > Preferences and you’ll see a settings menu appear within the browser window. Scroll down and click Show advanced settings… to bring up the privacy options.   Now, click the Content settings button, and then, to enable cookies, click Allow local data to be set (recommended). […]

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 […]

If you cannot connect to our VPN servers using our Windows app, you will see this troubleshooting message.  As this message suggests, there are a number of possible reasons for the problem. Your connection is blocked by your ISP or government If you live in a restrictive country then your […]

If you are using an Android device and would like to test new builds of Proton VPN app before they’re released publicly, you can join the Proton VPN Android app beta program. Like our non-beta Android VPN application, the beta is completely free to join and use. You can get […]

In cases Proton VPN can’t connect, please refer to the following list of solutions. Most of the steps described here can be done without direct support from our support team, but in case you get stuck or don’t know how to handle certain things, we will be there for you. […]