What is stunnel used for

Stunnel is an open-source multi-platform application used to provide a universal TLS/SSL tunneling service. Stunnel can be used to provide secure encrypted connections for clients or servers that do not speak TLS or SSL natively.

1. What does stunnel do in Linux?
2. Is stunnel a TCP or UDP?
3. What is the difference between stunnel client and server?
4. What is a stunnel connection?
5. Is stunnel a VPN?
6. What is the difference between SSH tunnel and stunnel?
7. What ports does stunnel use?
8. Where is stunnel?
9. Is client/server model still used?
10. Is stunnel a reverse proxy?
11. How do I know if my stunnel is running?
12. How do I know if stunnel is running in Linux?
13. How do I use stunnel client?
14. Where does stunnel log?
15. Where is stunnel installed?
16. What is alternative to stunnel?
17. What port does stunnel listen on?
18. What is the difference between accept and connect in stunnel?

What does stunnel do in Linux?

The stunnel program is an encryption wrapper between a client and a server. It listens on the port specified in its configuration file, encrypts the communitation with the client, and forwards the data to the original daemon listening on its usual port.

Is stunnel a TCP or UDP?

Stunnel should be able to secure any random protocol as long as the protocol satisfies the following requirements: The protocol is TCP, not UDP. The protocol doesn't use multiple connections, like ftp.

What is the difference between stunnel client and server?

stunnel can operate in two modes. The server mode works as a transparent proxy in front of a server, so that clients that connect to the server, need to negotiate an SSL and can then talk to the server (like POP3S). The client mode does the opposite thing.

What is a stunnel connection?

stunnel is an open-source multi-platform application used to provide secure encrypted connections for clients or servers that do not natively support SSL or TLS. stunnel uses the OpenSSL library to support the underlying TLS or SSL protocol.

Is stunnel a VPN?

Stunnel is an open-source a proxy service that adds TLS encryption to clients and servers already existing on a VPN network. TLS encryption provided by Stunnel can be used as an additional layer of encryption for data sent by VPN.

What is the difference between SSH tunnel and stunnel?

stunnel and ssh are for very different situations. ssh is a standard tool to connect to a machine and you can use local/remote forwards on top of your tunnels. stunnel is used in case of firewalls with deep packet inspection, blocking ssh traffic.

What ports does stunnel use?

The stunnel client on the client computer accepts MySQL connections on TCP port 3306 and creates an encrypted connection to TCP port 3307 on the server computer. The stunnel server on the server computer accepts the encrypted TCP connection on TCP port 3307 and has an encrypted conversation.

Where is stunnel?

Stunnel configures itself using a file named “stunnel. conf” which by default is located in “/etc/stunnel”. Next we specify a service for use with Stunnel.

Is client/server model still used?

Many workplaces use corresponding data to perform daily tasks, and information technology (IT) specialists are increasingly implementing client-server networks to manage information. Using a client-server network, you can efficiently access, share and secure data across devices.

Is stunnel a reverse proxy?

You can run stunnel in one of two modes: socket listener — much like in our inetd doc — and as an HTTP reverse proxy.

How do I know if my stunnel is running?

Log on to the Stunnel box, open a command prompt, and do a netstat -an. The ports should be open in LISTENING mode. If they are not, verify that Stunnel is running. If you have trouble launching Stunnel, check the stunnel.

How do I know if stunnel is running in Linux?

Log on to the Stunnel box, open a command prompt, and do a netstat -an. The ports should be open in LISTENING mode. If they are not, verify that Stunnel is running.

How do I use stunnel client?

Running an stunnel client requires installing stunnel and setting up a configuration file just like if you were setting up an Stunnel/Server, except swapping the accept and connect ports, since we want the client to accept local traffic (e.g., on port 8443) and send it on to the server that it connects to with SSL ( ...

Where does stunnel log?

Setting the Stunnel log level

In Troubleshooting > Logs, in the section Stunnel/HTTPD Log Management, you can set the log level for Stunnel. Stunnel is a library that MobileIron Ivanti EPMM uses for TLS encryption. These logs are captured in the /var/log/mi_messages file. The default log level is Emergency.

Where is stunnel installed?

Stunnel configures itself using a file named “stunnel. conf” which by default is located in “/etc/stunnel”. Next we specify a service for use with Stunnel. It can be any of the services which use networking such as mail server, proxy server, etc.

What is alternative to stunnel?

There are five alternatives to stunnel for a variety of platforms, including Linux, Mac, Windows, iPhone and iPad. The best alternative is Shadowsocks, which is both free and Open Source. Other great apps like stunnel are V2Ray, gobetween, Shadowrocket and Hitch TLS Proxy.

What port does stunnel listen on?

Stunnel Server Ports

Therefore the arrangement we will use is, stunnel will listen on port 443, open to external traffic, for SSL-encrypted stunnel traffic. This means that only stunnel can listen on 443, so this cannot be a server for an HTTPS web site.

What is the difference between accept and connect in stunnel?

The accept option is the port that will be used for telnet sessions. The connect option is the IP address of your remote server and the port it's listening on.