我已经在谷歌上搜索这个问题有一段时间了，但我还没有找到有效的解决方案。问题是 SSH 登录我的服务器突然变得非常慢。我可以看到身份验证大约需要 10 秒才能继续，这是我的 ssh 详细日志：
OpenSSH_7.3p1, LibreSSL 2.4.1
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 20: Applying options for *
debug1: Connecting to 54.86.29.78 [54.86.29.78] port 22.
debug1: Connection established.
debug1: key_load_public: No such file or directory
debug1: identity file .ssh/id_rsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file .ssh/id_rsa-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.3
debug1: Remote protocol version 2.0, remote software version OpenSSH_6.6.1p1 …ssh ×1