It’s somehow like a small secure VPN that runs on specific ports. What Stunnel basically does is that it turns any insecure TCP port into a secure encrypted port using OpenSSL package for cryptography. It can be used to add SSL functionality to commonly used inetd daemons like POP2, POP3, and IMAP servers without any changes in the program’s code. The Stunnel program is designed to work as an SSL encryption wrapper between remote client and local (inetd-startable) or remote server. How to migrate server data to a supported version.How to upgrade from Ubuntu 14.04 to Ubuntu 16.04.How to upgrade from Ubuntu 12.04 to Ubuntu 14.04.If you are currently operating a server running Ubuntu 12.04, we highly recommend upgrading or migrating to a supported version of Ubuntu: How To Encrypt Traffic to Redis with Stunnel on Ubuntu 16.04.We strongly recommend using a recent article written for the version of Ubuntu you are using. This article may still be useful as a reference, but may not follow best practices or work on this or other Ubuntu releases. Ubuntu 12.04 reached end of life (EOL) on Apand no longer receives security patches or updates. This article is deprecated and no longer maintained.

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