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Introduction
Yes, this is your step-by-step fix guide to Unravelling azure vpn error 720. In this post I’ll walk you through what this error means, why it pops up, and the exact steps you can take to fix it across Windows, macOS, iOS and Android. You’ll get practical checks, clear commands, and a few reusable tips to stop it from hobbling your work again.
If you want a quick workaround while you sort the root cause, consider NordVPN for a secure, reliable connection while you troubleshoot. 
What you’ll find in this guide:
- A clear explanation of error 720 and common causes
- A step-by-step plan you can follow to fix it quickly
- Platform-specific checks for Windows, macOS, iOS and Android
- How to test connectivity and confirm the fix
- When to escalate to Azure support or your IT team
- Essential resources you can refer back to
Useful URLs and Resources (unclickable text):
- Azure VPN Gateway documentation – learn.microsoft.com
- Azure Point-to-Site VPN overview – learn.microsoft.com
- Windows Networking Troubleshooter – support.microsoft.com
- VPN client log troubleshooting tips – docs.microsoft.com
- General VPN best practices for remote work – en.wikipedia.org/wiki/Virtual_private_network
Now, let’s break down the problem, the fixes, and how to prevent it from returning. Forticlient vpn wont install on windows 10 heres your fix
What is Azure VPN error 720?
Azure VPN error 720 is a connection error that appears when your computer tries to establish a VPN tunnel but the remote server rejects the request during the authentication phase. In practice, you’ll typically see a message along the lines of “The remote connection was not made because authentication of the remote computer failed” or “A connection to the remote computer could not be established.” The underlying issues can be caused by a mismatch in authentication methods, expired or invalid certificates, incorrect server address, client misconfiguration, or firewall restrictions blocking the required ports.
Key takeaway: error 720 is usually tied to authentication or basic connectivity checks between the client and the Azure VPN gateway. If you fix the authentication handshake or ensure the tunnel can be established at the network level, you’re most of the way there.
Why does error 720 occur with Azure VPN?
There are several frequent culprits behind error 720 in Azure VPN setups:
- Incorrect VPN type or gateway configuration: You might be using the wrong VPN protocol (IKEv2/IPsec vs SSTP) for the gateway or the gateway is configured for a different authentication method than your client expects.
- Certificate problems: If you’re using certificate-based authentication for Point-to-Site, expired, missing, or mistrusted root or user certificates will cause a failure.
- Credential or user permission issues: Wrong username/password, or the user not allowed to access the VPN gateway.
- Network or firewall blockers: Local firewall rules or network devices blocking essential VPN ports prevent tunnel establishment.
- Client misconfiguration: A misconfigured VPN profile (server address, domain, or split-tunnel settings) stops the handshake.
- Portal or policy changes on Azure: If the gateway policy was changed and your client profile wasn’t updated, you’ll get errors during authentication.
Understanding these causes helps you structure the fixes in a logical order rather than random trial-and-error.
Quick checks you can run before diving deeper
- Verify server address: Double-check the VPN gateway hostname or IP in the client profile.
- Confirm the VPN type matches the gateway: IKEv2/IPsec versus SSTP or L2TP/IPsec.
- Check credentials: Make sure your username and password (or certificate) are current and correctly installed.
- Inspect certificate validity (for certificate-based auth): Check expiry dates, trust chains, and that the root and leaf certs are correctly installed on the client.
- Review firewall rules: Ensure UDP ports 500, 4500 (IPsec/IKE), and (if applicable) UDP 1701 (L2TP) or 443 (SSTP) are allowed on the client network.
- Look for policy changes: Confirm there were no recent changes to the VPN gateway or access policies that would block your user.
If these checks don’t reveal the cause, move into the step-by-step fixes below. Mastering nordvpn wireguard config files on windows your ultimate guide
Step-by-step fixes (Windows, macOS, Linux, mobile)
The fixes are designed to be followed in order. Start with the simplest checks and move to deeper configuration if needed.
1) Update and patch the client
- Ensure your operating system is fully up to date (Windows Update, macOS Software Update, iOS/Android updates).
- Update the VPN client to the latest version supported by your system.
- Reboot after updates to clear any stale network state.
Why this helps: updates fix known bugs, improve compatibility with VPN gateways, and refresh security libraries used during the tunnel handshake.
2) Reconfirm credentials and profile settings
- Re-enter your username and password, or re-import your certificate if you’re using certificate-based authentication.
- Verify that the VPN profile matches the gateway’s settings (server name, policy, protocol).
- If you’re using Point-to-Site, ensure the certificate chain is intact and that you installed the Root CA and the user certificate properly.
Why this helps: many errors come from incorrect credentials or mismatched profiles.
3) Validate the gateway and authentication method
- Check with your IT team or Azure portal whether the gateway is configured for the same authentication method as your client (certificate-based vs username/password vs RADIUS).
- If possible, temporarily switch to a different authentication method to test connectivity.
Why this helps: mismatched methods lead to immediate authentication failures.
4) Certificate and trust checks (for certificate-based VPNs)
- Confirm certificates haven’t expired.
- Verify the root CA used by the gateway is trusted on the client device.
- Check the certificate template and usage (Enhanced Key Usage) align with VPN client requirements.
If you’re on Windows: Troubleshooting your azure vpn client fix those pesky connection issues
- Open Certificate Manager (certmgr.msc) and inspect Personal and Trusted Root Certification Authorities stores for both the user and computer accounts.
- Import the necessary root CA certificate if it’s missing.
On macOS:
- Open Keychain Access and verify the root and user certificates are present under the System or login keychains and set to “Always Trust” for VPN purposes.
5) Firewall and port configuration
- Confirm UDP 500 and UDP 4500 are open on both client and any intervening firewalls.
- If you’re using L2TP/IPsec, ensure UDP 1701 is allowed; for SSTP, ensure TCP 443 is accessible.
- If you’re on a corporate network, check that any proxy or DPI devices aren’t blocking VPN traffic.
Why this helps: tunnels won’t negotiate if the critical ports are blocked or throttled.
6) Reinstall the VPN client and reset the tunnel
- Remove the VPN connection/profile from the device.
- Reinstall or re-import the VPN profile with fresh configuration data from the Azure portal.
- On Windows, you can remove the VPN connection via Settings > Network & Internet > VPN, then re-add it.
- On macOS, delete the VPN profile in System Preferences > Network, then re-add.
- On mobile devices, delete the VPN profile and re-add from the VPN configuration in Settings.
Why this helps: stale or corrupt configuration data can cause persistent errors.
7) Check the network adapter and drivers
- Update or reinstall network adapter drivers.
- Disable and re-enable the VPN adapter (in Windows, you can do this from Network Connections).
- If you’re using VPN software that creates virtual adapters, ensure those components are not blocked by security software.
Why this helps: bad drivers or misbehaving virtual adapters can prevent tunnel creation. Cant download nordvpn on windows 11 heres how to fix it
8) Review Azure VPN gateway and policy changes
- Confirm that the gateway SKU and capacity aren’t under maintenance or experiencing issues.
- Check the VPN client profiles on the Azure portal and ensure that address ranges and split-tunnel settings match what you expect.
- If a recent change coincides with the error, revert or adjust the change and test again.
Why this helps: misconfigured gateway policies or changes can break client handshakes.
9) Review common Azure Point-to-Site and site-to-site specifics
- For Point-to-Site, ensure the root and user certificates are properly published to all users and that the client presents the correct certificate chain.
- For site-to-site, verify tunnel uptime, matches on both ends, and that the IPsec policy aligns.
Why this helps: Point-to-Site and site-to-site have different troubleshooting paths; mixing them can cause confusion and errors.
10) Use built-in logs and diagnostics
- On Windows, use Event Viewer > Applications and Services Logs > Microsoft-Windows-D-Cash and the RasClient logs to look for detailed error codes around the time of the failure.
- Generate and review VPN logs in the Azure portal for your gateway; look for authentication errors, certificate issues, or policy rejections.
- On macOS and mobile, check the VPN client logs or system logs for entries around the failed handshake.
Why this helps: logs provide precise error codes that guide targeted fixes.
11) Temporary workarounds (when you’re stuck)
- If the problem is purely authentication, temporarily switch to a different authentication method if your environment allows it (e.g., certificate-based instead of passwords, or vice versa).
- For urgent access, use a separate VPN provider as a workaround while you fix Azure VPN 720 for the long term.
Note: temporary workarounds should be used with caution and preferably with IT oversight.
12) When to escalate
- If you’ve exhausted the above steps and still see error 720, collect logs (VPN client, system logs, and Azure gateway diagnostics) and open a support case with Microsoft Azure Support or your IT department.
- Provide the exact error messages, timestamps, affected devices, and steps you’ve already tried. This helps the team diagnose faster.
Platform-specific guidance
Windows (10/11)
- Ensure Windows Firewall isn’t silently blocking the VPN client.
- Check that the VPN connection is configured for the correct protocol (IKEv2/IPsec is the common Azure Point-to-Site option).
- Use PowerShell commands to reset VPN: Get-VpnConnection, Remove-VpnConnection -Name “
“, Add-VpnConnection -Name “ ” -ServerAddress “ ” -TunnelType IKEv2 -AuthenticationMethod EAP. - Look at RasClient logs in Event Viewer for actionable error codes.
macOS
- Use the built-in Network preferences pane to manage the VPN and ensure the correct protocol is selected.
- Import the correct certificate chain if using certificate-based authentication.
- Check Keychain Access for certificate trust issues.
iOS and Android
- Confirm the VPN profile is updated with the correct server and authentication method.
- Ensure device time is correct; time skew can interfere with certificate validation.
- Check that device-level privacy or security settings aren’t blocking VPN connections.
Linux
- Depending on the distribution, you’ll configure strongSwan or another IPsec stack.
- Ensure the gateway’s IPsec policies match your client’s configuration.
- Verify that required services (ipsec,xl2tpd,xl2tpd) are running and accessible.
VPN best practices to prevent future errors
- Keep firmware and client software up to date.
- Use certificates with short validity and automated renewal where possible.
- Maintain a clear inventory of who has VPN access and what type of authentication they use.
- Regularly audit firewall rules and network security groups to ensure VPN ports aren’t inadvertently blocked.
- Document your Azure VPN gateway configurations so you can quickly compare against client setups when issues arise.
Real-world tips and quick wins
- If you’re in a corporate network, sometimes the simplest fix is to connect from a different network (home, mobile hotspot) to test whether the issue is network-specific.
- For remote workers, saving a working VPN profile locally (backups of the .xml or .vpnprofile files) lets you quickly swap to a known-good configuration.
- If you’re using multi-factor authentication, ensure the MFA method isn’t causing a delay or handshake failure during the VPN auth step.
Frequently asked questions
What is Azure VPN error 720?
Azure VPN error 720 is the generic failure that occurs when the client cannot establish a VPN tunnel to an Azure VPN gateway due to authentication or handshake problems. It usually indicates a mismatch in authentication, invalid certificates, or blocked network ports. Nordvpn blocking your internet heres how to fix it fast
How do I fix authentication errors on Azure VPN?
Verify credentials, confirm the authentication method matches the gateway, re-import certificates if used, and ensure the client profile is correct. Check logs to identify specific authentication error codes and address those (certificate trust, expiry, or password issues).
Which ports should be open for IKEv2/IPsec VPN?
Typically UDP ports 500 and 4500 need to be open for IPsec/IKEv2. If you’re using L2TP/IPsec, UDP 1701 is also required; for SSTP, TCP port 443 is used.
How can I test my VPN connection?
Attempt to connect from a known-good network, check the VPN client logs during the handshake, and verify gateway status in the Azure portal. If possible, try a different device to isolate device-specific issues.
What if my certificate is expired?
Replace or renew the certificate in both the Azure gateway and the client, import the new certificate into the appropriate store (certificate store on Windows, Keychain on macOS), and reapply the VPN profile.
How do I verify the gateway configuration in Azure?
Go to the Azure portal, navigate to your VPN gateway, review the connection configuration, authentication method, certificates, and the associated Point-to-Site or Site-to-Site settings. Ensure the gateway is healthy and online. How to confirm your ip address with nordvpn your step by step guide
Can I use a different VPN service temporarily?
Yes, for a temporary workaround you can use a trusted VPN service while you diagnose Azure VPN 720. Just ensure you’re using it in compliance with your organisation’s IT policies.
What logs are most helpful for troubleshooting?
VPN client logs, system event logs (RasClient on Windows), and Azure gateway diagnostics are the most informative. Look for authentication errors, certificate issues, and policy mismatches.
How often should I review VPN configurations?
Regularly review configurations whenever there are changes to gateways, certificates, or security policies. A quarterly audit plus any time you see connectivity issues is a good cadence.
Is time drift a potential cause?
Yes. If your device clock is significantly out of sync with the gateway, certificate validation can fail. Ensure your device time is accurate and set to the correct time zone.
When should I contact Microsoft Support?
If you’ve exhausted all troubleshooting steps, collected comprehensive logs, and still see error 720, reach out to Microsoft Support or your IT department with the exact error messages, timestamps, and the steps you’ve tried. Your guide to routers that speak vpn openvpn wireguard compatibility for home networks, setup, performance and security
A quick recap
- Error 720 usually signals an authentication or handshake problem between the client and the Azure VPN gateway.
- Start with simple checks: credentials, profile alignment, protocol, and firewall ports.
- Move through certificate validation, gateway settings, and client reinstallation if needed.
- Use logs and diagnostics to pinpoint exact failures.
- Don’t hesitate to escalate to IT or Microsoft Support if the problem persists.
If you found this guide helpful, consider bookmarking it for future VPN troubleshooting sessions. And remember, when you’re in a pinch, a reliable VPN like NordVPN can help you stay secure while you sort Azure VPN issues in the background.