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never heard about stcp nor i see something called like that in their github repository
Does it have authentication?
For safety i’d add an additional layer of authentication. Easy way: cloudflare access + cloudflare tunnel; hard mode: authelia + a reverse proxy
I had one of those NAS (NSA320). Even when they were new and suppoted they were using some ancient custom version of linux with ancient packages. It would be insane to expose them on the internet.