OpenVPN Initialization Sequence Complete with a .ovpn from VPNBook but no Internet connection

OpenVPN reports "Initialization Sequence Complete" because the client successfully authenticates and establishes the encrypted tunnel with the server. However, you have no Internet access because your operating system is not routing traffic through the virtual network interface, or the server is not forwarding packets back to your public IP address. This disconnect between tunnel establishment and actual data flow requires specific configuration checks on both the client and server sides to resolve.

Understanding the Tunnel vs. Traffic Distinction

The message "Initialization Sequence Complete" indicates that the TLS handshake succeeded, credentials were accepted, and the tun or tap interface was created. It does not guarantee that IP packets are flowing correctly. To verify if the tunnel itself is functional without relying on general Internet connectivity, you should test internal reachability. If you can ping the VPN server's internal IP address but cannot reach external sites like 8.8.8.8, the issue is almost certainly related to routing or NAT (Network Address Translation) rather than authentication. For a deeper dive into verifying interface access, refer to our guide on Verify whether a tun interface (created by OpenVPN) offers access to the Internet.

Client-Side Configuration: Pushed Routes and DHCP

Most VPN providers, including those using free services like VPNBook, configure their servers to push default routes to clients. This means the server sends a command telling the client to send all internet traffic through the VPN tunnel. Check your OpenVPN connection logs for lines containing "PUSHED CONFIGURATION". You should see directives such as:

push "redirect-gateway def1 bypass-dhcp"

If this directive is missing from the logs, your client is not instructed to route traffic through the VPN. In this case, you must manually add the route in your client configuration file (.ovpn) or use command-line arguments. Ensure your client config includes:

redirect-gateway def1 bypass-dhcp
dhcp-option DNS 8.8.8.8
dhcp-option DNS 8.8.4.4

The redirect-gateway def1 option replaces your default gateway with the VPN tunnel. The bypass-dhcp flag ensures this happens even if DHCP is managing other settings. Without this, your computer continues sending web requests to your local router, which ignores the VPN tunnel entirely. If you are experiencing issues where programs refuse to connect despite these settings, check our article on Program won't connect through OpenVPN for firewall-specific troubleshooting.

Server-Side Routing and NAT Masquerading

Even with correct client settings, the VPN server must be configured to forward traffic from the tunnel to the Internet and then return it. This process is called NAT masquerading or IP masquerading. On Linux-based VPN servers, this is typically handled by iptables or nftables rules. A common rule looks like this:

iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o eth0 -j MASQUERADE

This tells the server to take packets coming from the VPN subnet (e.g., 10.8.0.0/24), change their source IP to the server's public IP, and send them out via the physical interface (eth0). If this rule is missing, the server receives your request but tries to reply directly from its private IP, which your computer will reject because it doesn't know how to route to that private range. Additionally, ensure that IP forwarding is enabled on the server kernel by checking /proc/sys/net/ipv4/ip_forward. It should contain the value 1.

DNS Resolution Issues

Sometimes, the tunnel works, and you can ping 8.8.8.8, but websites fail to load. This is a DNS problem. Your ISP's DNS servers might be unreachable through the tunnel, or the VPN provider might not be pushing DNS options correctly. Configure your client to use reliable public DNS servers. Add the following lines to your .ovpn file:

dhcp-option DNS 1.1.1.1
dhcp-option DNS 1.0.0.1

Or, if you prefer manual configuration, set your system DNS to Cloudflare or Google DNS while the VPN is active. This ensures that domain name resolution happens correctly over the secure tunnel. If you are dealing with complex routing scenarios involving multiple networks, consider reviewing How to Route Traffic in the Reverse Direction in VPN Tunnels for advanced packet handling techniques.

Firewall and Security Software Interference

Local firewalls on Windows, macOS, or Linux can block traffic from the tun interface. Windows Defender Firewall, for instance, may prompt for permission when the tunnel starts. If you accidentally denied access, subsequent connections will fail silently or appear connected but lack data. Temporarily disable third-party antivirus or firewall software to test if they are blocking the tunnel. Also, ensure that your router allows UDP traffic on port 1194 (or whichever port the VPN uses). Some corporate or public Wi-Fi networks block VPN ports entirely, resulting in a successful handshake but immediate drop of data packets due to middlebox interference.

Frequently Asked Questions

Why can I ping the VPN server IP but not any website?

This confirms the tunnel is established but routing or DNS is broken. First, check if your client pushed the default route using redirect-gateway. If routing is correct, the issue is likely DNS; try pinging 8.8.8.8 to isolate DNS failures.

Does VPNBook still operate its servers?

Many free VPN providers, including older iterations of VPNBook, have shut down or changed infrastructure. Always verify the current status of the provider's website. If the servers are offline, no amount of client configuration will restore connectivity.

How do I check if IP forwarding is enabled on my Linux server?

You can check the status by running cat /proc/sys/net/ipv4/ip_forward in the terminal. A result of 1 means it is enabled, while 0 means it is disabled and needs to be turned on via sysctl settings.

What should I do if my firewall blocks the OpenVPN connection?

Temporarily disable your local firewall and antivirus software to test the connection. If it works, re-enable the firewall and create an inbound/outbound rule allowing traffic on the OpenVPN port (usually UDP 1194) and the tun/tap adapter.

Can I use a static IP instead of DHCP for the VPN interface?

Yes, but it is generally unnecessary and more complex. OpenVPN manages the IP assignment for the tunnel interface automatically. Manually setting IPs can lead to conflicts if the server changes the subnet or if multiple clients connect simultaneously.