Check whether a different server worksĬonnect to a different server in a different country and see if this issue persists. Sometimes, we need to take certain servers offline for maintenance and as such it can happen that they are temporarily unavailable. If you have auth problems, please use one of our recommend clients from our guides for macOS, Linux, Android, and iOS.Ĥ.
Make sure that you installed the correct client and have updated to the latest section.įor example, a staggering number of VPN clients (external link – CISRO research paper, PDF) available in the Android Play store are not properly implemented and pose a security risk instead of improving your privacy.ĭespite a few bad implementations, a good number of reliable clients exist. Make sure that you are using a reputable client. See here for more details on different servers or check out our different plans.ģ. Confirm that you’re accessing servers which are available for you Proton VPN planĬheck that the server you are trying to connect to is available for your subscription. Proton VPN has different plan offerings and each tier has access to a different set of servers.įor example Proton VPN Free users only get access to free servers in these countries, while Proton VPN Plus users get access to all servers in all countries, including Secure Core servers. See this article for details on where to find and set your OpenVPN credentials.Ģ. Proton VPN employs two sets of credentials, your Proton account credentials, used to log in on our homepage (or to your email if you are a Proton Mail user), and your OpenVPN credentials, which are used to authenticate with the VPN servers if you are using a 3rd party OpenVPN application.įor security reasons, you must use your OpenVPN credentials and not your Proton credentials when logging in via third party VPN applications. Make sure you are using your OpenVPN credentials ( and not your Proton credentials). Verify that you’re using correct OpenVPN credentials Please try the following steps to fix the problem:ġ. If you encounter this error, there are a number of things you can try to remedy this situation. Quick steps to fix an Authentication Failure error For more details, check out the different Proton VPN Plans. Free users get 1 connection, while Proton Plus users get up to ten connections. Different plans have different maximum number of simultaneous sessions. You have hit your maximum number of concurrent sessions.