Looking again, the oauth2_debug_auth setting likely takes effect when the server is started, since the oauth middleware and the logger for debugging gets attached at that time.
def register_middleware(omniauth)
omniauth.provider :oauth2_basic,
...
opts[:client_options][:connection_build] = lambda do |builder|
if SiteSetting.oauth2_debug_auth && defined?(OAuth2FaradayFormatter)
builder.response :logger,
Rails.logger,
{ bodies: true, formatter: OAuth2FaradayFormatter }
end
...
}
end
Most site settings do not require a restart, but you will need to restart your server for this particular setting to take effect.
That said, the real underlying issue is Faraday::TimeoutError (Timeout::Error), though. I don’t think my suggestion to turn off logs will fix your problem. You will likely have to check if there are any network issues between your Discourse instance and OAuth2 provider.