Update: I enabled ICMP and was able to ping and connect via ssh, after exiting terminal session, I asked a remote colleague to connect via ssh. He was able to connect successfully after a few attempts. Subsequently asked him to exit session after which I tried to initiate a ssh session and the request timed out. He can continue to connect (login) but my ping / ssh sessions time out. It seems that once a session is established it locks out all other requests - still trying to figure out the duration - whether it's temporary or in perpetuity.
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