Stunnel ssh9/19/2023 With Linux and ZFS, QuTS hero supports advanced data reduction technologies for further driving down costs and increasing reliablility of SSD (all-flash) storage. QuTS hero is the operating system for high-end and enterprise QNAP NAS models. It also generates custom instructions for all of these services. WIth Linux and ext4, QTS enables reliable storage for everyone with versatile value-added features and apps, such as snapshots, Plex media servers, and easy access of your personal cloud. Streisand sets up a new server running your choice of WireGuard, OpenConnect, OpenSSH, OpenVPN, Shadowsocks, sslh, Stunnel, or a Tor bridge. Tcp 0 0 127.0.0.1:456 0.0.0.0:* LISTEN 2964/appnameīy the way, running the same command on the remote should show sshd listening on port 127.0.0.1:123.QTS is the operating system for entry- and mid-level QNAP NAS. You can check that it's listening on the correct port with this: local:~# netstat -tulpn | grep LISTEN | grep appname The tunnel is working! But what if you have an application, called appname, which is supposed to be listening on port 456 on the local machine? Terminate nc on both sides then run your application. You should see this being mirrored on the local terminal: local:~# nc -l 127.0.0.1:456 net is provider Premium High Speed SSH, Stunnel (SSH Over SSL/TLS), OpenVPN, Squid Proxy, Shadowsocks. Tcp 0 0 localhost.localdo:33826 localhost.localdom:456 ESTABLISHEDīetter still, go ahead and type something on the remote: remote:~# nc 127.0.0.1 8888 Support for Windows, Android, Linux, Iphone etc. Tcp 0 0 localhost.localdom:456 localhost.localdo:33826 ESTABLISHED Something like this: local:~# netstat | grep 456 If you open a second terminal to the local machine, you can see the connection. Then make a connection on the remote: remote:~# nc 127.0.0.1 123 On CentOS it can be installed with yum install nc.įirst, open a listening port on the local machine: local:~# nc -l 127.0.0.1:456 Would be nice to actually see some data going through from the remote to the host. We should get an output similar to this: tcp 0 0 10.0.3.12:ssh 10.0.0.1:45988 ESTABLISHED Next, we want to check that the tunnel is open on the remote: remote:~# netstat | grep 10.0.0.1 Note that excluding the username before the remote IP, makes ssh use the current username. Otherwise, check that the SSH key is installed in the remote. If you see the command in the output, we can proceed. To check that the process is running, we can do: local:~# ps aux | grep ssh This can be done with the following command, on the local machine: local:~# ssh -N -R 123:127.0.0.1:456 10.0.3.12 The goal is to create a tunnel that will forward TCP traffic from the loopback address on the remote machine on port 123 to the local machine on port 456. I will prepend these hostnames, to the commands below, so it's obvious where they're being executed. Assume there is a machine, which will be called local with IP address 10.0.0.1 and another, called remote, at 10.0.3.12. Try installing the High Encryption Pack and all other service packs. Stunnel does not work with Windows with strong crypto. Recent versions of OpenSSH include a program called sftp which has an ftp-like feel. And I couldn't use nc -z because that option wasn't available on my incantation of netcat. All versions of SSH include a program called scp which works like rcp. Just grepping for the ssh process wasn't enough, as it was still there. I'm adding this answer because I had to troubleshoot the link between two applications after they stopped working. These are more detailed steps to test or troubleshoot an SSH tunnel.
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