From my original email: 
http://www.mail-archive.com/user@cassandra.apache.org/msg51736.html:

> My configuration changes:
>
> listen_address: <local or global scope IPv6 address>
> listen_interface_prefer_ipv6: true

listen_interface is commented out. I've just now tried again with "# 
listen_interface_prefer_ipv6: false" (option commented out), but the error 
persists. 

I've also rebooted the system, in case the upgrade from base 16.04 to 16.04.2 
left something in a funky state.

On 12/04/2017, 21:39, "Khaja, Raziuddin (NIH/NLM/NCBI) [C]" 
<raziuddin.kh...@nih.gov> wrote:

    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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