Troubleshooting Client VPN
Overview
Use this article to troubleshoot and resolve common client VPN connectivity issues.
Troubleshooting connectivity issues
Troubleshooting steps
- Blocked ports: Verify that UDP traffic on ports 500 and 4500 is reaching the MX. Check the firewall rules or access control lists on all firewalls between the client and MX. Try connecting from a client device using a different ISP.
- Client misconfiguration: Verify the client is configured correctly. Refer to the Client VPN OS Configuration for more information.
- User account issue: Verify the account is authorized to connect to VPN. Reset the password or connect with a working set of credentials to further isolate the issue.
- Device-specific issue: Try connecting with a different device to verify whether the issue is device-specific. Reset network settings or reset the device if the option is available.
Troubleshooting slow connections
If a connection over VPN appears slow, first identify whether the slowness affects all traffic over the tunnel or only specific resources. If the connection is slow to one application but normal for other resources via the tunnel, the issue is likely not related to the VPN connection.
VPN speeds depend on a lot of factors including bandwidth on the MX security appliance and client side, number of clients connected to MX or number of VPN tunnels on the MX.