Are you specifying both the listen_address and listen_interface, or just one of 
the two?

Send,  an example of the following 3 lines.  Here is what I have on my 2.1.16 
cluster that uses ipv6:

listen_address: hhhh:hhhh:hhh:hhhh:h:hhhh:hhh:h
# listen_interface: eth0
# listen_interface_prefer_ipv6: false

Also, looking at my config, I can confirm that it is uneccessary or wrong to 
escape the ipv6 address with \ as I suggested before.

-Razi

On 4/12/17, 4:05 PM, "Martijn Pieters" <mjpiet...@fb.com> wrote:

    From: "Khaja, Raziuddin (NIH/NLM/NCBI) [C]" <raziuddin.kh...@nih.gov>
    > Maybe you have to escape the IPV6 addresses in the cassandra.yaml in the 
same way.
    > I think it’s worth a try.
    
    Nope, no luck. You get an error instead:
    
        ERROR [main] 2017-04-12 20:03:46,899 CassandraDaemon.java:752 - 
Exception encountered during startup: Unknown listen_address 
'hhhh\:hhhh\:hhhh\:hhhh\:hhhh\:h\:hh\:h'
        
    (actual address digits replaced with h characters).
    
    Martijn
        
        
        
    
    
    

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