The most common reasons Proton VPN fails to connect

Proton VPN stops connecting most often because your internet connection dropped, your login credentials changed, or the app needs an update. Less commonly, your firewall is blocking the connection, your device's system clock is wrong, or Proton's servers are temporarily down in your region. The fastest way to narrow it down is to restart your device first — this fixes roughly half of connection problems without any other troubleshooting.

Before you start, open Proton VPN's status page at protonvpn.com/status to check whether servers in your region are actually running. If they show red or yellow, the problem is on Proton's end and you cannot fix it yourself. If they show green, move to the steps below.

Key Takeaways

  • Restart your device and check Proton's status page first — these two steps solve most connection failures without any other work.
  • Make sure your login password is correct and your Proton account is not locked or suspended due to too many failed attempts.
  • Update Proton VPN to the latest version, because older versions sometimes cannot connect to current servers.
  • Check your firewall and antivirus settings, which may be blocking Proton's connection protocol without telling you.
  • If nothing works, switch to a different connection protocol in Proton's settings — UDP often works when TCP does not.

Check your login and account status

Proton VPN will not connect if your password is wrong or your account is locked. Log out completely from the app, then try logging in again and watch for any error message. If you see "too many failed login attempts" or "account locked", wait 30 minutes before trying again — Proton locks accounts temporarily after repeated wrong passwords.

If you have changed your Proton password recently, make sure you are using the new one. Proton VPN does not always update automatically when you change your password elsewhere. If you cannot remember your password, go to protonvpn.com, click "Sign in", then click "Forgot password?" to reset it. You will need access to the email address on your account.

Check whether your Proton subscription is still active. Free Proton VPN accounts work, but they have limits — you can only use three locations and speeds are slower. If you downgraded from a paid plan, you may have lost access to servers you were using. Log into your Proton account at protonvpn.com to see which servers your current plan includes.

Update Proton VPN to the latest version

Older versions of Proton VPN sometimes cannot connect to current servers. Check your app store for updates: on Windows, open the Microsoft Store and search for Proton VPN; on Mac, open the App Store; on iPhone or Android, open your device's app store and search for Proton VPN. If an update is available, install it and restart the app.

If you installed Proton VPN directly from Proton's website rather than through an app store, go to protonvpn.com/read and read the latest version for your device. Uninstall the old version first, then install the new one. Restart your device after installing.

Check your firewall and antivirus settings

Your firewall or antivirus software may be blocking Proton VPN without showing you a warning. Windows Defender, Norton, McAfee, and other security software sometimes treat VPN apps as suspicious. Look for a notification in your security software's settings or notification area — it may say something like "blocked app" or "connection denied".

To test whether your firewall is the problem, temporarily disable it and try connecting to Proton VPN. On Windows, open Settings, go to Privacy & Security, then Windows Security, then Firewall & Network Protection, and click "Manage settings" under each network type to turn the firewall off. On Mac, go to System Settings, Security & Privacy, Firewall, and click the lock to turn it off. If Proton VPN connects when the firewall is off, add Proton VPN to your firewall's allowed apps list and turn the firewall back on.

If you use third-party antivirus software, open its settings and look for a section called "Firewall", "Network Protection", "App Control", or "Blocked Apps". Add Proton VPN to the allowed list. The exact steps vary by software — if you cannot find it, search "[your antivirus name] allow app through firewall".

Switch your connection protocol

Proton VPN uses different protocols to connect — the two most common are TCP and UDP. Some networks or firewalls block one but not the other. If you cannot connect using the default protocol, try switching.

Open Proton VPN and go to Settings. Look for a section called "Protocol", "Connection Protocol", or "VPN Protocol". You will usually see options like "Automatic", "UDP", "TCP", or "IKEv2". Change it from whatever it is set to now — if it says "Automatic", try "UDP"; if it says "UDP", try "TCP". Close the settings, disconnect if you are connected, and try connecting again. If one protocol works, stick with it.

Check your device's system clock

Proton VPN uses your device's system clock to verify that your connection is find. If your clock is wrong by more than a few minutes, the connection will fail silently without showing an error message. Check the time in your device's system tray or settings.

On Windows, right-click the time in the bottom right corner and click "Adjust date and time". Make sure "Set time automatically" is turned on. On Mac, go to System Settings, General, Date & Time, and make sure "Set date and time automatically" is on. On iPhone or Android, go to Settings, Date & Time, and turn on "Automatic date & time". Restart Proton VPN after fixing the clock.

Restart your device and your internet connection

Restart your device completely — do not just close and reopen Proton VPN. Power off your computer or phone, wait 10 seconds, and power it back on. This clears temporary connection problems that the app alone cannot fix.

While your device is restarting, also restart your modem and router. Unplug your modem from power, wait 30 seconds, and plug it back in. Wait for all lights to stop blinking and stabilize. Then unplug your router, wait 30 seconds, and plug it back in. Wait for it to stabilize as well. This clears connection problems on your network side.

Once everything is back on, open Proton VPN and try connecting again. If you still cannot connect after restarting both your device and your network hardware, move to the other steps above.

Contact Proton support if nothing works

If you have tried all the steps above and Proton VPN still will not connect, the problem may be specific to your account or your network. Go to protonvpn.com/support and click "Contact us". Describe what you have already tried — mention that you restarted your device, checked the status page, updated the app, and tried different protocols. Include your device type and operating system version.

Proton support usually responds within 24 hours on weekdays. They can see whether your account has any flags or restrictions that would prevent connection, and they can tell you whether your region or network has known issues with Proton's servers.

Frequently Asked Questions

Why does Proton VPN connect sometimes but not always?

Intermittent connection usually means a specific server is overloaded or your network connection is unstable. Try connecting to a different server location — if that works, the original server may be congested. If all servers fail intermittently, restart your modem and router, and check whether your internet provider is having outages in your area.

Does Proton VPN work on public WiFi?

Proton VPN usually works on public WiFi, but some networks block VPN connections entirely. Coffee shops, hotels, and airports sometimes do this. If you cannot connect on public WiFi but can at home, the network itself is blocking VPN traffic. You cannot bypass this — you would need to use a different network or wait until you have a different internet connection.

What does "connection timeout" mean?

A timeout means your device tried to reach Proton's server but did not get a response within the time limit. This usually means the server is too far away, too slow, or temporarily down. Try a server in a closer country, or wait a few minutes and try again. If timeouts happen on all servers, restart your modem.

Can I use Proton VPN on multiple devices at once?

Free Proton VPN accounts can only connect on one device at a time. Paid plans allow multiple simultaneous connections — the number depends on which plan you have. If you are trying to use it on two devices and only one connects, log out on one device first, then log in on the other.

Will Proton VPN work if my internet is very slow?

Proton VPN can work on slow internet, but it will be slower still because it encrypts all your traffic. If your base internet speed is below 5 Mbps, VPN will feel noticeably sluggish. The connection itself should still work — if it does not, the problem is not the speed but something else on this page.