我正在尝试使用Sequel Pro通过SSH连接到我的DigitalOcean SSD的远程MySQL数据库。这是我的设置：
尝试连接时，我得到：
SSH端口转发失败。
在'读取初始通信数据包'时失去与MySQL服务器的连接，系统错误：0
Used command: /usr/bin/ssh -v -N -o ControlMaster=no -o ExitOnForwardFailure=yes -o ConnectTimeout=10 -o NumberOfPasswordPrompts=3 -i /Users/tintin/.ssh/id_rsa -o TCPKeepAlive=no -o ServerAliveInterval=60 -o ServerAliveCountMax=1 -p 22 root@mywebapp.com -L 61232/188.226.150.240/3306
OpenSSH_6.2p2, OSSLShim 0.9.8r 8 Dec 2011
debug1: Reading configuration data /etc/ssh_config
debug1: /etc/ssh_config line 20: Applying options for *
debug1: Connecting to mywebapp.com [188.226.150.240] port 22.
debug1: fd 3 clearing O_NONBLOCK
debug1: Connection established.
debug1: identity file /Users/tintin/.ssh/id_rsa type 1
debug1: identity file /Users/tintin/.ssh/id_rsa-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.2
debug1: Remote protocol version 2.0, remote software version OpenSSH_6.0p1 Debian-3ubuntu1.2
debug1: match: OpenSSH_6.0p1 Debian-3ubuntu1.2 pat OpenSSH*
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-md5 none
debug1: kex: client->server aes128-ctr hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Server host key: RSA 42:f3:30:1b:ff:24:92:17:62:19:13:03:e9:65:0d:42
debug1: Host 'mywebapp.com' is known and matches the RSA host key.
debug1: Found key in /Users/tintin/.ssh/known_hosts:4
debug1: ssh_rsa_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: Roaming not allowed by server
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,password
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /Users/tintin/.ssh/id_rsa
debug1: Server accepts key: pkalg ssh-rsa blen 279
debug1: Authentication succeeded (publickey).
Authenticated to mywebapp.com ([188.226.150.240]:22).
debug1: Local connections to LOCALHOST:61482 forwarded to remote address 188.226.150.240:3306
debug1: Local forwarding listening on ::1 port 61482.
debug1: channel 0: new [port listener]
debug1: Local forwarding listening on 127.0.0.1 port 61482.
debug1: channel 1: new [port listener]
debug1: Requesting no-more-sessions@openssh.com
debug1: Entering interactive session.
debug1: Connection to port 61482 forwarding to 188.226.150.240 port 3306 requested.
debug1: channel 2: new [direct-tcpip]
channel 2: open failed: connect failed: Connection refused
debug1: channel 2: free: direct-tcpip: listening port 61482 for 188.226.150.240 port 3306, connect from 127.0.0.1 port 61484, nchannels 3
（我尽可能用假数据替换了我的IP地址，用户名和应用名称。）
我已经多次通过SSH登录我的服务器了，所以我无法理解为什么它也不能与Sequel Pro一起使用。
我在这里缺少什么？
感谢您的帮助。
答案 0 :(得分：1)
debug1: Connection to port 61482 forwarding to 188.226.150.240 port 3306 requested.
debug1: channel 2: new [direct-tcpip]
channel 2: open failed: connect failed: Connection refused
这表明mywebapp.com上的ssh服务器实例尝试连接到188.226.150.240端口3306，以便为端口提供服务，并且拒绝连接＆＃34;错误。
＆＃34;连接被拒绝＆＃34;通常意味着没有任何东西正在侦听该地址和端口上的连接。最简单的解释是mysql服务器没有运行，或者它在不同的接口和/或端口上侦听而不是你尝试连接的东西。
您应该登录188.226.150.240并使用＆＃34; netstat＆＃34;查看是否有任何内容正在侦听端口3306.你可能会发现msyql没有运行，或者它只是在监听localhost接口，或者是那些沿着这些行的东西。
或者，可以将防火墙等网络设备设置为模拟拒绝连接＆＃34;他们决定阻止连接的条件。如果ssh服务器和mysql服务器之间的网络流量通过防火墙，您可以调查它是否因某种原因阻止了流量。