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I don't like using the TCP functionality of ngrok because it seems to always use the same hostname (0.tcp.ngrok.io) with a random port. So anyone can just scan

by vhost- 10y ago

I don't like using the TCP functionality of ngrok because it seems to always use the same hostname (0.tcp.ngrok.io) with a random port. So anyone can just scan for open ports on that domain and start trying to connect to things. The HTTP forwarding at least gives you a random subdomain.