Why Your VPN Won’t Connect & How to Fix It

VPN services are designed to be simple. That’s great when they’re working properly, but frustrating when they’re not.

Often, VPN apps don’t explain why the VPN won’t connect. Instead, you’ll see the connection icon spin indefinitely, or the app will simply say “unable to connect”.

We’ve listed below all of the common reasons why your VPN won’t connect to a VPN server:

1. Your Internet Connection is Unstable

A VPN needs a stable internet connection to work. If your network is dropping out, or your ISP is having problems, your VPN has nothing solid to build its connection on.

A weak WiFi signal or patchy mobile data will do the same thing. Before you blame the VPN, confirm your underlying connection, whether that’s your broadband, WiFi, or router, is actually working.

2. The VPN Server is Congested or Undergoing Maintenance

When too many people pile onto the same VPN server, it gets overwhelmed. That’s server congestion, and it leads to painfully slow speeds and, often, a connection that won’t establish at all.

It’s most common on free VPNs, which cram a lot of users onto very few servers.

You’ll hit the same wall if the server is down for maintenance, or if you’ve used up your VPN’s simultaneous connection limit. In each case, the app simply fails to connect.

3. Your Firewall or Antivirus Is Blocking Your VPN

A firewall’s job is to screen everything moving in and out of your network and block anything that looks suspicious.

An encrypted VPN tunnel, especially on an uncommon port, can resemble exactly the kind of traffic it’s built to stop, so it can shut the connection down before it ever forms.

Antivirus software does much the same thing. If either one flags your VPN as a threat, the app simply won’t connect.

4. Your ISP or WiFi Network is Blocking VPN Traffic

Public, school, or corporate WiFi networks can sometimes block VPN connections using security software. These networks may have policies in place to restrict VPN usage and prevent any unwanted network activity.

If you are unable to connect to your VPN while using a school, public, or otherwise restricted network, try switching to a different WiFi network or use mobile data if you can.

If you’re at work and need to access your company’s internal network using a VPN, contact your IT department for assistance configuring your device and VPN connection.

In highly-censored countries like China, it’s also possible that your Internet Service Provider (ISP) will attempt to identify and block VPN traffic altogether.

In that case, you’ll need a VPN with obfuscation technology, which disguises your VPN traffic as “normal.”

5. The VPN Software Is Outdated or Too Slow

An outdated app is one of the most common reasons a VPN won’t connect. Old versions fall out of step with the latest security updates and stop working properly, so keeping the app current is essential.

A slow or low-quality VPN causes the same trouble. As with congestion, this mostly affects free services running on weak infrastructure: if the server takes too long to answer your device, the connection never forms.

6. VPN Ports Are Blocked

VPNs connect over specific ports. The main ones are UDP 1194 for OpenVPN and UDP 500 for IKEv2/IPSec.

You might also see TCP 1723 listed for PPTP, but steer clear of PPTP. It’s old, slow, and no longer considered secure.

If these ports are blocked by your ISP, firewall, or router — or they’re not properly configured — it can prevent the VPN from establishing a successful connection.

In some network setups, specific ports need to be forwarded to allow VPN traffic to pass through effectively. If this isn’t set up properly, the VPN client and server might not be able to communicate.

Not all VPNs allow you to change the port your device uses to connect to the internet, but Private Internet Access and Proton VPN are both top-tier VPNs that do.

If your router is blocking standard VPN ports, you may need to configure which ports are open manually. This can usually be done through your router’s settings page.

7. Manual VPN Connections Are Misconfigured

Most VPN apps handle their own setup, but settings can still end up wrong, or the app can hold onto outdated ones. A reset or reinstall clears up most of these.

If you’re connecting manually, without an app, double-check that every configuration detail matches what your VPN service provided. A single wrong value will stop the connection.

The quickest way to fix a VPN that won’t connect is to work through the likely causes in order, starting with the fixes that take seconds and resolve the most cases, then moving to the more advanced ones. Work through the steps below in sequence.

Before you start, open the notifications or messages section of your VPN app, if it has one. It may already be telling you exactly what’s wrong.

1. Restart Your Device and Router

Start with the fix that resolves more failed connections than any other: restarting your hardware. Turn off your device and your router, wait 10 seconds, then switch them both back on. This clears most temporary network glitches.

While you’re at it, confirm your internet works without the VPN by opening a website with it switched off. If nothing loads, the problem is your connection, not the VPN. Check your ISP’s status page for outages in your area, or run a quick speed test to confirm your connection is stable enough to support a VPN.

If your connection is fine but still unreliable, resetting your network settings can help. Restart your router or modem, update its firmware, renew your IP address, or reset your network adapters.

2. Try a Different Server

The server you’re connecting to may be down, full, or under maintenance. Switching to another is one of the fastest fixes there is.

Open your app’s server list and choose a different server in the same location. If that still won’t connect, try a different VPN location entirely, in case the whole region is having problems.

3. Update the App

An outdated app is a common and easily missed cause of connection failures. Old versions fall out of step with the latest security updates and can simply refuse to connect.

Check for an update and install it. Most VPN services can update themselves automatically, so turn that option on to avoid the problem in future.

4. Change Your Protocol

The protocol your VPN uses to connect can be the sticking point. Some networks and countries block specific ones, OpenVPN included.

Open your settings and set the protocol to Automatic if it isn’t already. If that doesn’t work, try each option in turn, including the UDP and TCP variants, until one connects.

On a restricted network, such as at work, school, or in a censored country, your VPN’s obfuscation or Stealth mode is usually the most reliable choice.

5. Disable Your Firewall and Antivirus to Test

Your firewall or antivirus can mistake a VPN connection for a threat and block it before it forms, usually because the app has been flagged as a security risk.

To check, switch both off for a moment and try connecting. If that’s the culprit, add your VPN to the program’s list of trusted or allowed apps, then switch your protection back on. Don’t leave your firewall and antivirus disabled.

6. Reset the VPN to Its Default Settings

If changing your server and protocol hasn’t worked, a misconfigured setting may be to blame. Look for a Restore Default Settings button on the app’s settings page and use it.

One setting is worth checking directly: if DNS leak protection is misbehaving, it can stop your device resolving addresses and block the connection. Turn it off, along with advanced features like multi-hop, trusted networks, and split tunneling, then try again.

If it still won’t connect, uninstall the app completely and reinstall it. This clears out any corrupted settings or files behind the problem.

7. Check for Blocked Ports

This is a more advanced fix, but worth trying if nothing above works. VPNs connect over specific ports, and your firewall, ISP, antivirus, or network administrator may be blocking the one yours uses.

Switch your VPN to a different port if it lets you. OpenVPN defaults to 1194 UDP; if that’s blocked, common alternatives include 500, 1701, and 4500.

Table showing which ports VPN protocols can use.

VPN Protocol	Ports to Try
OpenVPN UDP	53, 80, 443, 1194, 1197, 1198, 2049, 2050, 8080, 9201
OpenVPN TCP	443, 1443, 80, 110
WireGuard UDP	53, 80, 443, 1194, 2049, 2050, 30587, 41893, 48574, 58237

If you’re comfortable with it, you can also open the necessary ports manually in your router or firewall settings. Your VPN service can tell you which ones it needs.

8. Contact Customer Support

If you’ve worked through everything above, contact your VPN service directly. The best ones offer support over live chat or email and can spot issues on their end that you can’t see.

Give them as much detail as you can: your device and operating system, the protocol you’re using, and any error messages you’ve seen. The more they have to go on, the faster they’ll diagnose it.

9. Switch to a Better VPN

A VPN that repeatedly refuses to connect may simply not be good enough. Free and budget services often run on a handful of overcrowded servers with limited resources, and an unreliable connection is the first thing to suffer.

Of the 59 VPNs we’ve tested, the best ones connect in seconds, every time. If yours can’t manage that, it’s worth switching to one that can.