I think it would also be helpful to post the parameters that I'm using to 
launch it too - 

*Server*
/opt/TurboVNC/bin/vncserver -SecurityTypes X509Vnc -x509cert 
/home/user/ca/certs/localhost.cert.pem -x509key 
/home/user/ca/certs/localhost.key.pem -rfbauth /home/user/ca/t.file


*Viewer*
/home/user/my_vnc_viewer -x509ca /home/user/ca/certs/CA.cert.pem -passwd 
/home/user/ca/t.file localhost:2


On Friday, July 12, 2019 at 11:03:33 AM UTC-4, Andy wrote:
>
> Hey so I have some strict requirements on what encryption ciphers we are 
> allowed to use.
>
> Basically I need it to use either TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384 
> or TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384. 
>
> From the viewer side I'm able to restrict the ciphers available to it by 
> modifying the java argument inside of the vncviewer script:
>  and adding on the options 
> -Djava.security.properties=/opt/test/java.security.restictive 
> -Djavax.net.debug=ssl
>
> Now I get an SSL Handshake error when I try to connect - I think its 
> because Xvnc doesn't support the 2 ciphers that I'm trying to use. 
>
> How would I go about enabling the two ciphers from the server (Xvnc) side? 
> I'd prefer to not have to recompile, but I'm not afraid to.
>
>
> Thanks!
>

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