Build Failure: gpg: keyserver receive failed: unknown pubkey algorithm

[beam_PreCommit_Website_Stage] $ /bin/bash -xe /tmp/jenkins6730031359263725887.sh
+ gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB
gpg: requesting key D39DC0E3 from hkp server keys.gnupg.net
gpg: requesting key 39499BDB from hkp server keys.gnupg.net
gpgkeys: key 409B6B1796C275462A1703113804BB82D39DC0E3 can't be retrieved
gpgkeys: key 7D2BAF1CF37B13E2069D6956105BD0E739499BDB can't be retrieved
gpg: no valid OpenPGP data found.
gpg: Total number processed: 0
gpg: keyserver communications error: keyserver helper general error
gpg: keyserver communications error: unknown pubkey algorithm
gpg: keyserver receive failed: unknown pubkey algorithm