Unable to receive and add Tor's keys to apt

Question

I'm following this to install Tor on a Debian based machine.

However, I'm unable to add Tor's gpg key to the system's apt repository:

root@fenrir:~# gpg --keyserver keys.gnupg.net --recv A3C4F0F979CAA22CDBA8F512EE8CBC9E886DDD89
gpg: keyserver receive failed: No keyserver available
root@fenrir:~# gpg --keyserver keys.gnupg.net --recv 886DDD89
gpg: keyserver receive failed: No keyserver available
root@fenrir:~# gpg --keyserver keyserver.ubuntu.com --recv 886DDD89
gpg: keyserver receive failed: No keyserver available
root@fenrir:~# gpg --keyserver keyserver.ubuntu.com --recv A3C4F0F979CAA22CDBA8F512EE8CBC9E886DDD89
gpg: keyserver receive failed: No keyserver available
root@fenrir:~# gpg --keyserver pgp.mit.edu --recv A3C4F0F979CAA22CDBA8F512EE8CBC9E886DDD89
gpg: keyserver receive failed: No keyserver available
root@fenrir:~# gpg --keyserver sks-keyservers.net --recv A3C4F0F979CAA22CDBA8F512EE8CBC9E886DDD89
gpg: keyserver receive failed: Connection refused

I'm unsure if the GPG keys of Tor are no longer available or if the key servers are down.

Answer 1

Works here, either the servers were down (unlikely) or you can't access them because they are blocked (e.g. Firewall)

You can import the key manually like this:

gpg --import PATH_TO_KEY
gpg --export A3C4F0F979CAA22CDBA8F512EE8CBC9E886DDD89 | sudo apt-key add -

You can get the key here