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If I remember correctly, you're running roughenough [1] for the roughtime server, right? What software are you running for NTS?

[1] https://github.com/int08h/roughenough

We wrote our own server which will be open sourced hopefully in the coming months.

Can we telnet? Trying to telnet roughtime.cloudflare.com 2002 and getting nothing...

down

You have to use a roughtime client. It's a UDP protocol and we don't respond to malformed packets.

What strategy are you guys using for leap seconds?

We follow RFC 5905 which specifies how upcoming leap seconds are handled. The linux kernel will step the time and the timestamps in UTC will be correct. NTP handles leap seconds robustly.