Comparison of SSH servers

SSH servers is a software program which uses the secure shell protocol to accept connections from remote computers. This article compares a selection of popular servers.

General

Name	Developer	Status	Date of first release	Last release	Date of last release	License	Official web page
CopSSH	Itefix	Template:Active	2009-01-16	3.0.1	2009-10-12	BSD	CopSSH
Dropbear	Matt Johnston	Template:Active	2003-04-06	0.52	2008-11-12	MIT	Dropbear
F-Secure SSH Server	F-Secure	?			2004?	commercial
freeSSHD	Kresimir Petri	?		1.2.6	2009-??-??	?	[1]
KpyM	KpyM	Template:Active		1.18	2009-08-01	BSD	[2]
lsh	Niels Möller	Template:Active	1999-05-23	2.9-exp	2007-04-04	GPL	LSH
OpenSSH	The OpenBSD project	Template:Active	1999-12-01	5.3	2009-10-01	BSD	OpenSSH
Reflection for Secure IT	Attachmate	Template:Active		7.1		commercial	[3]
Tectia	SSH Communications Security	Template:Active	1995	6.1		commercial	SSH Communications Security
VShell server	VanDyke Software, Inc.	Template:Active	1995	3.6	2009-12-10	commercial	VanDyke VShell

Platform

The operating systems or virtual machines the SSH servers are designed to run on without emulation; there are several possibilities:

• No indicates that it does not exist or was never released.
• Partial indicates that while it works, the server lacks important functionality compared to versions for other OSs but may still be under development.
• Beta indicates that while a version is fully functional and has been released, it is still in development (e.g. for stability).
• Yes indicates that it has been officially released in a fully functional, stable version.
• Dropped indicates that while the server works, new versions are no longer being released for the indicated OS; the number in parentheses is the last known stable version which was officially released for that OS.
• Included indicates that the server comes pre-packaged with or has been integrated into the operating system.

The list is not exhaustive, but rather reflects the most common platforms today.

Name	Mac OS X	Mac OS Classic	Windows	Cygwin	BSD	Linux	Solaris	Palm OS	Java	OpenVMS	Windows Mobile	IBM z/OS	AmigaOS	AIX	HPUX	iPhoneTemplate:Refun / iPod Touch	WebOS
CopSSH	No	No	Yes	Yes	No	No	No	No	No	No	No	No	No	No	No	No	No
Dropbear	Yes	No	No	Yes	Yes	Yes	Yes	No	No	No	No	No	No	No	No	No	YesTemplate:Refun
lsh	Yes	No	No	No	PartialTemplate:Refun	Yes	Yes	No	No	No	No	No	No	No	No	No	No
OpenSSH	included	No	YesTemplate:Refun	included	included	included Template:Refun	Yes	No	No	Yes	No	Yes	Yes	YesTemplate:Refun	Yes	YesTemplate:Refun	YesTemplate:Refun
KpyM	No	No	Yes	No	No	No	No	No	No	No	No	No	No	No	No	No	No
freesshd	No	No	Yes	No	No	No	No	No	No	No	No	No	No	No	No	No	No

• ^  lsh supports only one BSD platform officially, FreeBSD.^{[citation needed]}
• ^  The majority of Linux distributions have OpenSSH as an official package, but a few do not.
• ^  Openssh 3.4 was the first release included since AIX^{[citation needed]}
• ^  Unless otherwise noted, iPhone refers to non-jailbroken devices.
• ^  [4]
• ^  Only for jailbroken devices.
• ^  OpenSSH and Dropbear are available as optware packages installed by PreWare (maintained by WebOS-Internals.org)

Features

Name	SSH1	SSH2	Port forwarding	SFTP	SCP	Compatible with OpenSSH authorized keys	Privilege separation
CopSSH	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Dropbear (software)	No	Yes	Yes	No	No	Yes	??
Lsh	No	Yes	Yes	Yes	Yes	??	??
OpenSSH	Yes	Yes	Yes	Yes	Yes	Yes	Yes

See also

• Comparison of SSH clients