Can't reach key server - are you behind a (company) firewall?
If you can't reach any key server, chances are you are behind a firewall.
To work around this
- open GPG Keychain
- from the top menu select GPG Keychain > Preferences...
(⌘ , Keyboard Shortcut)
- Key server tab
- paste
hkps://hkps.pool.sks-keyservers.net:443
into the address field - press Enter to confirm
If that doesn't work, try the less secure
hkp://hkps.pool.sks-keyservers.net:80
option.
If you are good friends with the IT department, ask them to open up port 11371 TCP and save your colleagues some trouble.