开放端口 22

什么是端口 22？安全外壳登录

这是 well-known 端口（0–1023），常被 SSH 等核心服务使用。 · RFC 4251, RFC 4252, RFC 4253, RFC 4254

什么情况下需要开放端口 22？Open if you need remote terminal access, SCP/SFTP file transfers, or Git over SSH to this machine. Keep closed on desktop workstations with no remote administration needs. Restrict access to known IP ranges where possible.

常见用途与软件OpenSSHDropbearBitvise SSH ServerPuTTY (client)Git over SSHVS Code Remote SSH安全Port 22 is one of the most heavily scanned ports on the internet, targeted by automated brute-force bots. Disable password authentication and require SSH key pairs (Ed25519 recommended). Restrict access to known IP ranges in your firewall. Consider moving SSH to a non-standard port (e.g., 2222) to reduce automated scan noise — this reduces log spam but is not a security substitute for key-based auth.

端口 22 安全吗？开放端口会增加攻击面。安全性取决于 SSH 的配置。

中风险保持 SSH 及时更新安全补丁。要求强身份验证并将访问限制为最低必要的 IP 地址。