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Remember on Windows to quote pathnames and use double backslashes, e. If you want to run multiple OpenVPN instances on the same machine, use a different port number for each one. You will need to open up this port on your firewall. Use "dev tap0" if you are ethernet bridging and have precreated a tap0 virtual interface and bridged it with your ethernet interface. On non-Windows systems, you can give an explicit unit number, such as tun0. On Windows, use "dev-node" for this. Non-Windows systems usually don't need this. Each client and the server must have their own cert and key file. The server and all clients will use the same ca file.
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Background A error happens when we are unable to make a TCP connection to your origin server. Specifically, Cloudflare tried to connect to your origin server on port 80 or , but received a connection refused error. Check your origin web server. If you have just moved to Cloudflare and you are seeing a over HTTPS, it is possible that your origin server has not been configured to allow port be accessed by Cloudflare IPs. These modules will block any time an IP that connects more than 22 times. Since all connections are now coming from a Cloudflare IP, you will definitely hit the limit causing the error page. As soon as you unload the module, the issue will disappear. If your firewall is configured to DROP packets rather than refuse connections, it will cause a ; meaning an incorrectly configured firewall can actually masquerade as a connection timeout error. If you see the error railgun.