Unable to Add a node to master

Hello, Puppet enterprise v 2015.2.0 I'm unable to add a node to master with command curl -k https://abc.abc.com:8140/packages/current/install.bash | sudo bash. it says ""The following signatures were invalid: KEYEXPIRED 1468001658" I manually deleted the old key and added the new key in the node but the node is still picking up the old key. I followed the steps provided in https://puppet.com/blog/updated-puppet-gpg-signing-key to add the new key. I also found a support ticket for the same issue but unable to open the ticket (access issues). https://ask.puppet.com/question/29880/updating-apt-key-for-ubuntu-1604-lts-on-master/ Thanks in advance