This article provides detailed instructions on securing SSH with public key authentication, and suggests using free FRP providers. It includes a TOML configuration example for ‘ssh_service’ type, recommends Masscan for discovering open ports, and proposes potential candidates to consider.

ssh port must be secured with pubkey only authentication

search for free frp or frp 免费 to get free frp providers

use masscan over these servers to find open ports and candidates

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serverAddr = "frp.freefrp.net"
serverPort = 7000
auth.method = "token"
auth.token = "freefrp.net"
[[proxies]]
name = "ssh_service"
type = "tcp"
localIP = "127.0.0.1"
localPort = 22
remotePort = <remote_port>

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