Take a look here then and see what you have got the jmx authentication set to, 
see if that helps you.

https://www.guru99.com/cassandra-security.html#7

Sorry for the short answer, New Years Day and away from my computer to look 
things up properly.

Sent from my iPhone

> On 1 Jan 2021, at 23:14, Manu Chadha <manu.cha...@hotmail.com> wrote:
> 
>  Just nodetool doesn't work unfortunately 
> 
> Sent from my iPhone
> 
>>> On 1 Jan 2021, at 21:28, Paul Chandler <p...@redshots.com> wrote:
>>> 
>>  Hi Manu,
>> 
>> nodetool uses the JMX user and password, I think the normal default for that 
>> is for it not being required, but not sure if that is the case for the setup 
>> you are using. So just try nodetool flush and see if that works.
>> 
>> Regards 
>> 
>> Paul 
>> 
>> Sent from my iPhone
>> 
>>> On 1 Jan 2021, at 20:41, Manu Chadha <manu.cha...@hotmail.com> wrote:
>>> 
>>> 
>>> In fact, I notice that I can’t run any nodetool command. I get the error 
>>> even when running nodetool status command
>>>  
>>> Sent from Mail for Windows 10
>>>  
>>> From: Manu Chadha
>>> Sent: 01 January 2021 20:36
>>> To: user@cassandra.apache.org
>>> Subject: username/password error when using nodetool flush
>>>  
>>> Hi
>>>  
>>> Happy New Year.
>>>  
>>> I am trying to use `nodetool flush -u username` but I get error `nodetool: 
>>> Failed to connect to '127.0.0.1:7199' - FailedLoginException: 'Invalid 
>>> username or password'.`
>>>  
>>> I am using the same credentials which I use in `cqlsh -u -p`.  As far as I 
>>> can observe, I am using the right values.
>>>  
>>> I am running `cassandra` using `kubernetes` and `K8ssandra`. I have `SSH`ed 
>>>  to a node and am running `nodetool flush` in the container by getting a 
>>> shell in the container using ` docker exec -it 
>>> k8s_cassandra_k8ssandra-dc1-default-sts-0_default_00b0d72a-c124-4b04-b25d-9e0f17edc582_0
>>>  /bin/bash `.
>>>  
>>> What mistake I might be making? Is there some other credential I need to 
>>> use?
>>>  
>>> Thanks
>>> Manu
>>>  
>>> Sent from Mail for Windows 10
>>>  
>>>  

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