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Home on Grumpy · Jun 14, 2021

Fix Virtualmin Proxy with Let's Encrypt

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This is a minor inconvenience that I’ve dealt with for far too long. When using Virtualmin as a reverse proxy, it doesn’t handle Let’s Encrypt verification records correctly and forwards them to the upstream service. In my case, this would cause certificates to issue correctly initially, but then fail to renew after three months is up. Since every request that hits the server was…

This is a minor inconvenience that I’ve dealt with for far too long. When using Virtualmin as a reverse proxy, it doesn’t handle Let’s Encrypt verification records correctly and forwards them to the upstream service.

In my case, this would cause certificates to issue correctly initially, but then fail to renew after three months is up. Since every request that hits the server was getting sent to the upstream server (including any requests to .well-known), the HTTP challenge will always fail.

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