In the afternoon, we tried to setup a reverse ssh tunnel from surveillance room to server room.
But after we typed in the command, we get no response from the server.
From the captured packet of wireshark, we found that the ssh version mismatch cause this problem.
So update openssh to the newest version.
$ ssh -V
OpenSSH_5.3p1, OpenSSL 1.0.1e-fips 11 Feb 2013
$ wget http://openbsd.mirror.garr.it/pub/OpenBSD/OpenSSH/portable/openssh-6.6p1.tar.gz
$ tar zxvf openssh-6.6p1.tar.gz
$ cd openssh-6.6p1
$ ./configure
$ make
$ sudo make install
$ ssh -V
OpenSSH_6.6p1, OpenSSL 1.0.1e-fips 11 Feb 2013

在尝试从监控室到服务器室建立逆向SSH隧道时遇到问题,通过更新OpenSSH版本解决了版本不匹配导致的无响应问题。
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