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Stunnel

5.49
Stunnel Screenshot
License:
Free Freeware
Language:
Publisher:
Michal Trojnara
OS:
Windows 10 / 8 / 7 / Vista / XP
Updated:
Sep 5, 2018
Technical:
[+] More Details

Stunnel Review

Stunnel is a free and open source ssl encryption wrapper app filed under servers and made available by Michal Trojnara for Windows.

The review for Stunnel has not been completed yet, but it was tested by an editor here on a PC and a list of features has been compiled; see below.

If you would like to submit a review of this software download, we welcome your input and encourage you to submit us something!

Stunnel has been picked by our editors as very good.
Stunnel has been tested for viruses and malware.
We have tested Stunnel 5.49 against malware with several different programs. We certify that this program is clean of viruses, malware and trojans. [Read more]

Publisher's Description

Adds a layer of SSL encryption between clients and local servers:

The stunnel program is designed to work as an SSL encryption wrapper between remote client and local (inetd-startable) or remote server. It can be used to add SSL functionality to commonly used inetd daemons like POP2, POP3, and IMAP servers without any changes in the programs' code. Stunnel uses the OpenSSL library for cryptography, so it supports whatever cryptographic algorithms are compiled into the library.

Stunnel can benefit from FIPS 140-2 validation of the OpenSSL FIPS Object Module, as long as the building process meets its Security Policy. A scanned FIPS 140-2 Validation Certificate document is available for download on the NIST web page.

Stunnel features and highlights:
  • Load sharing among multiple backend servers
  • External session cache (for clusters)
  • Compression (for limited bandwidth)
  • Support for OpenSSL Security Features:
  • Certificate-based access control
  • CRL and OCSP certificate revocation
  • SNI (Server Name Indication) support for name-based virtual servers
  • PFS (Perfect Forward Secrecy) with DH and ECDH key agreement
  • FIPS mode (for compliance)
  • Configuration of hardware engines
  • GUI
  • Saving cached peer certificate chains to files
  • Windows service mode
  • IPv6 support
  • Protocol negotiation for cifs, connect, imap, nntp, pgsql, pop3, proxy, and smtp
  • Delayed resolver (for dialup connections and remote hosts with dynamic IP addresses)
  • Graceful configuration file reloading
  • Graceful log file reopening
  • Ident access control

Stunnel is licensed as Freeware for Windows (32-bit and 64-bit) operating system / platform from servers without restrictions. Stunnel 5.49 is available to all software users as a free download (Freeware).


This ssl encryption wrapper software is filed under:
  • Stunnel Download
  • Freeware Servers
  • Open source and GPL software

Compatibility with this ssl encryption wrapper software may vary, but will generally run fine under Microsoft Windows 10, 8, 8.1, 7, Vista and XP on either a 32-bit or 64-bit setup. A separate x64 version may be available from Michal Trojnara.

Page maintained by Fernando Ortega.

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