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Stunnel 5.15 Beta 1

An easy to use SSL encryption wrapper tool

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Stunnel screenshotThe Stunnel software is developed to work like an SSL encryption wrapper among remote client and local or remote server. It can be used to add SSL a range of capabilities to mainly used internet services daemons like POP2, POP3, and IMAP servers without modifying the code of the program. Stunnel utilizes the OpenSSL library for cryptography, so it supports any cryptographic algorithms are assembled into the library.

Portability (Threading Models):

- PTHREAD (Posix)
- FORK (traditional Unix)
- UCONTEXT (userlevel)
- WIN32

Performance and scalability:

- Load sharing between multiple backend servers
- External session cache (for clusters)
- Compression (for narrow bandwidth)

Support for OpenSSL Security features:

- Access control with TLS-PSK and certificates
- CRL and OCSP certificate annulment
- SNI (Server Name Indication) support for name based virtual servers
- PFS (Perfect Forward Secrecy) with DH or ECDH key accord
- FIPS mode
- OpenSSL engines, including CAPI (Microsoft CryptoAPI)

Other Cross-platform features:

- Remote (socket) and local (inetd-style) method
- Load balancing remote targets with round-robin and priority strategies
- Redirection of SSL client connections on authentication failing
- IPv6 support
- TLS protocol negotiation for:
- cifs
- connect
- imap
- nntp
- pgsql
- pop3
- proxy
- smtp
- socks4, socks4a, socks5
- Delayed resolver (for dial-up connections or dynamic remote IP)
- Configuration file reloading
- Log file reopening
- UTF-8 configuration and log files
- Ident access control

Unix features:

- Unix socket support
- Socket activation with systemd feature
- Transparent proxy on preferred platforms
- Optional pseudo-terminal allocation for the local method
- Logging to syslog
- chroot (additional security)
- setuid and setgid (additional security)
- Libwrap (TCP Wrappers) access control
- EGD (Entropy Gathering Daemon) client

Windows features:

- Saving cached peer certificate chains to files
- Windows service mode

Name Stunnel
Version 5.15 Beta 1
Developer | see all products from this developer
Product Homepage Stunnel
License Free (Freeware)
Last Week Downloads 3
All Time Downloads 1,552
Filename stunnel-5.15b1-installer.exe
Filesize 1.3MB
MD5 Checksum 3A011F3F10C6B44CBEF8DB50BE9E5F8A
OS Support Windows All
Category Utilities

100% CLEAN Certification

BadgeStunnel has been tested by team against viruses, spyware, adware, trojan, backdoors and was found to be 100% clean. Our editors will recheck this software periodically to assure that it remains clean.


Old Versions

Software Date Added
Stunnel April 04, 2015 - Latest Version

Download the free Stunnel