SecureCRT连接Ubuntu报The remote system refused the connection.解决方案
使用SecureCRT连接到远程Ubuntu，连接失败报The remote system refused the connection.
进入Ubuntu系统，终端中敲入以下命令：
ps -ef|grep ssh
发现只有ssh-agent进程，而没有sshd进程，缺省情况下没有安装ssh-server
在终端中敲入以下命名安装openssh-server即可
sudo apt-get install openssh-server
安装过程如下，网络快的话两分钟左右，安装完毕后再次使用ps -ef|grep ssh命令查看sshd进程是否运行，如果正常运行使用SecureCRT重新尝试连接即可。
Reading package lists... DoneBuilding dependency treeReading state information... DoneThe following extra packages will be installed:libck-connector0 ncurses-term openssh-client openssh-sftp-serverpython-requests python-urllib3 ssh-import-idSuggested packages:libpam-ssh keychain monkeysphere rssh molly-guardThe following NEW packages will be installed:libck-connector0 ncurses-term openssh-server openssh-sftp-serverpython-requests python-urllib3 ssh-import-idThe following packages will be upgraded:openssh-client1 upgraded, 7 newly installed, 0 to remove and 264 not upgraded.Need to get 1,279 kB of archives.After this operation, 3,896 kB of additional disk space will be used.Do you want to continue? [Y/n] YGet:1 http://us.archive.ubuntu.com/ubuntu/ trusty/main libck-connector0 i386 0.4.5-3.1ubuntu2 [10.1 kB]Get:2 http://us.archive.ubuntu.com/ubuntu/ trusty/main ncurses-term all 5.9+20140118-1ubuntu1 [243 kB]Get:3 http://security.ubuntu.com/ubuntu/ trusty-security/main openssh-client i386 1:6.6p1-2ubuntu2.3 [576 kB]Get:4 http://security.ubuntu.com/ubuntu/ trusty-security/main openssh-sftp-server i386 1:6.6p1-2ubuntu2.3 [35.6 kB]Get:5 http://security.ubuntu.com/ubuntu/ trusty-security/main openssh-server i386 1:6.6p1-2ubuntu2.3 [324 kB]Get:6 http://security.ubuntu.com/ubuntu/ trusty-security/main python-requests all 2.2.1-1ubuntu0.2 [43.0 kB]Get:7 http://us.archive.ubuntu.com/ubuntu/ trusty/main python-urllib3 all 1.7.1-1build1 [38.9 kB]Get:8 http://us.archive.ubuntu.com/ubuntu/ trusty/main ssh-import-id all 3.21-0ubuntu1 [9,624 B]Fetched 1,279 kB in 1min 37s (13.2 kB/s)Preconfiguring packages ...Selecting previously unselected package libck-connector0:i386.(Reading database ... 169027 files and directories currently installed.)Preparing to unpack .../libck-connector0_0.4.5-3.1ubuntu2_i386.deb ...Unpacking libck-connector0:i386 (0.4.5-3.1ubuntu2) ...Preparing to unpack .../openssh-client_1%3a6.6p1-2ubuntu2.3_i386.deb ...Unpacking openssh-client (1:6.6p1-2ubuntu2.3) over (1:6.6p1-2ubuntu2) ...Selecting previously unselected package ncurses-term.Preparing to unpack .../ncurses-term_5.9+20140118-1ubuntu1_all.deb ...Unpacking ncurses-term (5.9+20140118-1ubuntu1) ...Selecting previously unselected package openssh-sftp-server.Preparing to unpack .../openssh-sftp-server_1%3a6.6p1-2ubuntu2.3_i386.deb ...Unpacking openssh-sftp-server (1:6.6p1-2ubuntu2.3) ...Selecting previously unselected package openssh-server.Preparing to unpack .../openssh-server_1%3a6.6p1-2ubuntu2.3_i386.deb ...Unpacking openssh-server (1:6.6p1-2ubuntu2.3) ...Selecting previously unselected package python-urllib3.Preparing to unpack .../python-urllib3_1.7.1-1build1_all.deb ...Unpacking python-urllib3 (1.7.1-1build1) ...Selecting previously unselected package python-requests.Preparing to unpack .../python-requests_2.2.1-1ubuntu0.2_all.deb ...Unpacking python-requests (2.2.1-1ubuntu0.2) ...Selecting previously unselected package ssh-import-id.Preparing to unpack .../ssh-import-id_3.21-0ubuntu1_all.deb ...Unpacking ssh-import-id (3.21-0ubuntu1) ...Processing triggers for man-db (2.6.7.1-1) ...Processing triggers for ureadahead (0.100.0-16) ...ureadahead will be reprofiled on next rebootProcessing triggers for ufw (0.34~rc-0ubuntu2) ...Setting up libck-connector0:i386 (0.4.5-3.1ubuntu2) ...Setting up openssh-client (1:6.6p1-2ubuntu2.3) ...Setting up ncurses-term (5.9+20140118-1ubuntu1) ...Setting up openssh-sftp-server (1:6.6p1-2ubuntu2.3) ...Setting up openssh-server (1:6.6p1-2ubuntu2.3) ...Creating SSH2 RSA key; this may take some time ...Creating SSH2 DSA key; this may take some time ...Creating SSH2 ECDSA key; this may take some time ...Creating SSH2 ED25519 key; this may take some time ...ssh start/running, process 5002Setting up python-urllib3 (1.7.1-1build1) ...Setting up python-requests (2.2.1-1ubuntu0.2) ...Setting up ssh-import-id (3.21-0ubuntu1) ...Processing triggers for libc-bin (2.19-0ubuntu6) ...Processing triggers for ureadahead (0.100.0-16) ...Processing triggers for ufw (0.34~rc-0ubuntu2) ...
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