My machine's HTTP server doesn't load over VPN

26 Aug 2025
Knowledge

Problem

An HTTP server is running on your machine, and you can open it locally, but you're unable to open it remotely over VPN.

Cause

The standard included certificate on the HTTP server may not be compatible with remote connections in modern browsers.

Solution

Replace the certificate on the HTTP server with a new self-signed certificate. You can either create one yourself using one of the many online guides or use this generated certificate (valid until 2044). The exact steps on how to upload the new certificate onto the HTTP server depend on the hardware. Please contact the manufacturer for instructions.

This was confirmed to be the solution for a Helmholz ModbusTCP Coupler.

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My machine's HTTP server doesn't load over VPN

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My-machines-HTTP-server-doesnt-load-over-VPN

My machine's HTTP server doesn't load over VPN

Introduction

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My machine's HTTP server doesn't load over VPN

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