How to install gpg keys from behind a firewall?

I understand that keyservers are using the port 11371 but in many cases you are not allowed to connect to this port and you cannot add

There a many cases when you cannot modify the firewall configuration.

Example command that fails

 gpg --keyserver keyserver.ubuntu.com --recv-keys 0A5174AF

How do you solve this issue?

Some key servers answer to port 80 as well:

gpg --keyserver hkp://wwwkeys.de.pgp.net:80 --recv-keys 0A5174AF

And since hkp relies on http, you should be able to use it trough a web proxy too.

Something like

gpg --keyserver hkp://p80.pool.sks-keyservers.net:80 \
    --keyserver-options "timeout=40 http-proxy=$http_proxy" \
    --recv-keys B0F4253373F8F6F510D42178520A9993A1C052F8

The decisive part is http-proxy=$http_proxy, which can be replaced with http-proxy=http://corporate.proxy.test:8765 for example.

BTW: https://askubuntu.com/a/102505/519948

try this

sudo apt-key adv --keyserver-options http-proxy="http://<username>:<password>@<proxy_server_addr>:<proxy_port>" --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys <key_to_import>

How to install gpg keys from behind a firewall?

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