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[Falco]

@Samir_Faci

Unable to download data from https://rubygems.org/ - Net::OpenTimeout: execution expired

@Samir_Faci

A wget the rubygems works fine, internet connectivity is fine.

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Can't build container, no clear errors

The real problem is this one: If the server/container can’t access the Discourse source code in GitHub it won’t be able to build/update. Since you said it works on the host, you need to debug the container networking. Drop to a similar container shell with docker run --it debian:buster-slim bash and debug from there.