I am trying to update my metasploit exploit DB on Kali Linux (Debian) running msfupdate. Getting the error 'KEYEXPIRED'. Found the expired key using 'apt-key list'. Ut when I run the command below I receive the error:

gpg: requesting key xxxxxx from hkp server keys.gnupg.net
?: keys.gnupg.net: Network is unreachable
gpgkeys: HTTP fetch error 7: couldn't connect: Network is unreachable
gpg: no valid OpenPGP data found.
gpg: Total number processed: 0[/I]

The command I am running is:
sudo apt-key adv --recv-keys --keyserver keys.gnupg.net xxxxxx

I can see this traffic go through my firewall. Any ideas? I need to get metasploit updated to finsih a pen test.