I have setup proxy and I can do curl/wget properly with the proxy. I have got both http and https proxy setup. I have also exported them to both lowercase and uppercase, e.g. https_proxy and HTTPS_PROXY.
I've got the exact same issue, update won't work for us at all but install works fine. To update our plugins we've chosen to run for i in $(/opt/logstash/bin/plugin list); do /opt/logstash/bin/plugin install "$i"; done
The update function has given us nothing but trouble since the plugin system was introduced.
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