Fedora has been part of an GPG sks service[1] for a number of years running off of keys.fedoraproject.org. Last year, there were a number of attacks made on the service which due to its 'write-only' nature makes it impossible to clean up [2] [3]. When the attacks came up, and it was clear it was not easily fixable, we moved keys to a proxy only mode. However this mode has not been too stable and caused other issues.

Fedora Infrastructure has tried to figure out ways to run a service replacement, but currently has not found one which we can with the resources we have available. We plan to turn off and decommission keys.fedoraproject.org on 2020-02-10. 

We currently recommend people to use https://keys.openpgp.org/ which offers lookup capabilities.

[1] https://bitbucket.org/skskeyserver/sks-keyserver/wiki/Home
[2] https://gist.github.com/rjhansen/67ab921ffb4084c865b3618d6955275f
[3] https://www.zdnet.com/article/openpgp-flooded-with-spam-by-unknown-hackers/

Stephen J Smoogen.