@Kurt, You have hit the nail on the head.

Whilst it was an issue with the cassandra-env.sh file, and I fixed this by 
overwriting it with the default file, essentially rolling it back, which got me 
back in, the larger issue is with the system_auth db it is a REPL factor of 1 
and thus as stated in this doc 
http://docs.datastax.com/en/datastax_enterprise/4.8/datastax_enterprise/sec/secConfSysAuthKeyspRepl.html

Attention: To prevent a potential problem logging into a secure cluster, set 
the replication factor of the system_auth and dse_security keyspaces to a value 
that is greater than 1. In a multi-node cluster, using the default of 1 
prevents logging into any node when the node that stores the user data is down.

Thank you ALL for coming back to me and assisting, Kurt, good shout and thanks 
for getting me where I need to be, which is back up and running.

Keep up the great work Community!!

From: kurt greaves [mailto:[email protected]]
Sent: 23 August 2017 11:14
To: User
Subject: Re: C* 3 node issue -Urgent

The cassandra user requires QUORUM consistency to be achieved for 
authentication. Normal users only require ONE. I suspect your system_auth 
keyspace has an RF of 1, and the node that owns the cassandra users data is 
down.

Steps to recover:
1. Turn off authentication on all the nodes
2. Restart the nodes and make sure they are UN
3. Alter system_auth to have a higher RF than 1 (3 is probably appropriate)
4. Turn auth back on and restart
5. Create a new user and use that from now on.

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