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ADC 13 supports DTLS 1.2. https://docs.citrix.com/en-us/citrix-adc/13/ssl/support-for-dtls-protocol.html#dtlsv12-cipher-support-on-the-front-end-vpx-appliances

But ADC 13 is 😞... anyway, thanks for that Carl

You should give build 13 a try. The latest version works stable, at least what I figured out so far...