If its down, you could try the manual way:
Create a blank file, paste in this text, and save it:
-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: SKS 1.0.10
mI0ESXyuWQEEALtXc9eel/l6rrMSjF0cvIpiHAbsAX0svo3QZiSmwMhF6WMODKinzF0Vdk6H
/I4tMwWx2u7VYZapdLlD9IFeiwW+VevdY/LWtrYJtE8c0jj7ka4EcJu/e1UgfhVhmXonDSNG
Hz1RqtI5dY4Hf7L1UrngEdut16VxSK00/ujYSQnlABEBAAG0H0xhdW5jaHBhZCBQUEEgZm9y
IENydW5jaEJhbmdlcnOItgQTAQIAIAUCSXyuWQIbAwYLCQgHAwIEFQIIAwQWAgMBAh4BAheA
AAoJEChuKUSTwrw07uID/3SaUnGN05HcjWGOX4WXf6oAB/LOOXwpW9eTjnbLJmS0edsW8v+H
m7nE+39ciXpdW8c/2BxFqX+3BWo2V2Ug2uO240lxbTkfk9eSAqtdHrvUjYNDH2AasCBsGzb+
jszH61Bm2eqOYULMK1NyIwpHav5hNCKW1iFasFWPCk1RABb4
=i1ym
-----END PGP PUBLIC KEY BLOCK-----
Now open Synaptic and go to Settings > Repositories > Authentication (tab) > Import Key File... > select the file you made.
Note: ** Please read before posting **BTW if you wish to contact me, send me an e-mail instead of a PM.