Comparison of SSH servers

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An SSH server is a software program which uses the secure shell protocol to accept connections from remote computers. SFTP/SCP file transfers and remote terminal connections are popular use cases for an SSH server. This article compares a selection of popular servers.

General[edit]

Name Developer Status First release date Last release Last release date License
Apache MINA SSHD Apache Software Foundation Active 2009 0.14.0 2015-03-03[1] Apache License v2
Attachmate Reflection for Secure IT] Attachmate Active 2005 8.0 2012-11-14 Proprietary
Bitvise SSH Server (formerly WinSSHD) Bitvise, Ltd. Active 2001-05 6.07 2014-05-04[2] Freeware for non commercial use
Copssh Itefix Active 2003-08-12 5.0.4 2015-03-06[3] Commercial, Free Edition available[4]
CrushFTP Server CrushFTP, LLC Active 2003-01-01 7.0.2 2014-02-06 Commercial, shareware
Dropbear Matt Johnston Active 2003-04-06[5] 2014.66 2014-10-23[6] MIT
freeSSHd SSH Server WEONLYDO Software Active 1.3.0[Note 1] unknown[Note 2] Freeware (source available for purchase)
GoAnywhere Services Linoma Software Active 2009-09-01 3.3.4 2013-09-18 Commercial
KpyM SSH Server KpyM Telnet/SSH Server Active 2002-10 1.19c 2011-01-29 Open Source BSD
lsh Niels Möller Active 1999-05-23[7] 2.1 2013-06-26 GPL
Maverick SSHD SSHTOOLS Limited Active 2004 1.6.9 2015-01-12 Commercial
MobaSSH SSH Server Mobatek Active 1.22 Freeware for non commercial use
OpenSSH The OpenBSD project Active 1999-12-01 6.8 2015-03-18[8] BSD
Pragma Fortress SSH Server Pragma Systems, Inc. Active 2004-05-24 5.0 2011-04-20[9] Commercial
Tectia SSH Server SSH Communications Security (formerly Tectia) Active 1995-07 6.4.8 2014-10-28 Commercial
PowerShell Server /n software Active 6.0.4798 [10] 2013-02-19 Commercial, free personal edition
SilverSHielD Extenua, Inc. Active 2008-10 6.0.25.125 2013-12-04[11] Free for personal use
Georgia SoftWorks SSH Server Georgia SoftWorks Active 2004-07 8.05.0031 2014-10-24 Commercial
Syncplify.me Server Syncplify, Inc. Active 2014-02 3.0.2.32 2014-10-05[12] Free for personal use
TinySSH Jan Mojžíš Active 2014-02-16 20150501 2015-05-01 Public Domain

Platform[edit]

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 Java OpenVMS z/OS AmigaOS AIX HPUX iOS: iPhone,[Note 3] iPod Touch webOS Android
Apache MINA SSHD Yes No Yes No Yes Yes Yes Yes No No No Yes Yes No No No
Attachmate Reflection for Secure IT No No Yes No No Yes Yes No No No No Yes Yes No No No
Bitvise SSH Server No No Yes No No No No No No No No No No No No No
Copssh No No Yes Yes No No No No No No No No No No No No
CrushFTP Server Yes No Yes Yes Yes Yes Yes Yes No No No Yes Yes No No No
Dropbear Yes No No Yes Yes Yes Yes No No No No Yes Yes No Yes[Note 4] Yes
freeSSHd No No Yes No No No No No No No No No No No No No
KpyM SSH Server No No Yes No No No No No No No No No No No No No
GoAnywhere Services Yes Yes Yes No Yes Yes Yes Yes No No No Yes Yes No No Yes
lsh Yes No No No Partial[Note 5] Yes Yes No No No No No No No No  ??
Maverick SSHD Yes No Yes No Yes Yes Yes Yes No No No Yes Yes No No Yes
MobaSSH SSH Server No No Yes Yes No No No No No No No No No No No No
OpenSSH Included No No Included Included Included [Note 6] Yes No Yes Yes Yes Yes[Note 7] Included Yes[Note 8] Yes[Note 4] Partial
Pragma Fortress SSH Server No No Yes No No No No No No No No No No No No  ??
Tectia SSH Server No No Yes No No Yes Yes No No Yes No Yes Yes No No  ??
PowerShell Server No No Yes No No No No No No No No No No No No No
SilverSHielD No No Yes No No No No No No No No No No No No No
Georgia SoftWorks SSH Server No No Yes No No No No No No No No No No No No No
Syncplify.me Server No No Yes No No No No No No No No No No No No No
TinySSH Yes No No No Yes Yes Yes No No No No Yes Yes No No No

Features[edit]

Name SSH1 SSH2 Port forwarding SFTP SCP Supports IPv6 Supports OpenSSH authorized keys Privilege separation FIPS 140-2 certified
Apache MINA SSHD No Yes Yes Yes Yes Yes Yes No  ?
Attachmate Reflection for Secure IT No Yes Yes Yes Yes Yes Yes Yes Yes
Bitvise SSH Server No Yes Yes Yes Yes Yes Yes Yes Yes
Copssh Yes Yes Yes Yes Yes Yes Yes Yes[13]  ?
CrushFTP Server No Yes Yes Yes Yes Yes Yes Yes  ?
Dropbear No Yes Yes No Yes Yes Yes No  ?
KpyM SSH Server Yes Yes Yes Yes No Yes Yes Yes  ?
GoAnywhere Services Yes Yes Yes Yes Yes Yes Yes Yes Yes
Lsh No Yes Yes Yes Yes  ?  ?  ?  ?
Maverick SSHD No Yes Yes Yes Yes Yes Yes No  ?
MobaSSH SSH Server Yes Yes Yes Yes Yes Yes Yes Yes  ?
OpenSSH Yes Yes Yes Yes Yes Yes Yes Yes[13]  ?
Pragma Fortress SSH Server Yes Yes Yes Yes Yes Yes Yes Yes Yes
Tectia SSH Server No Yes Yes Yes Yes Yes Yes Partial[Note 9] Partial
SilverSHielD No Yes Yes Yes No No Yes No  ?
Georgia SoftWorks SSH Server No Yes Yes No No Yes No Yes  ?
Syncplify.me Server No Yes Yes Yes No Yes Yes Yes  ?
TinySSH No Yes No No No Yes Partial[Note 10] Partial[Note 11]  ?

See also[edit]

Notes[edit]

  1. ^ An authentication bypass vulnerability (CVE-2012-6066) was present in versions 1.2.6 and earlier of FreeSSHd. It is not known if or when this vulnerability was fixed, as no public statement about it from the developers could be found. The security of the current version is therefore unknown.
  2. ^ Announcements or release notes showing a date when 1.3.0 was released could not be found, but it was likely in 2014.
  3. ^ Unless otherwise noted, iPhone refers to non-jailbroken devices.
  4. ^ a b OpenSSH and Dropbear are available as optware packages installed by PreWare (maintained by WebOS Internals)
  5. ^ Lsh supports only one BSD platform officially, FreeBSD.[citation needed]
  6. ^ Most Linux distributions have OpenSSH as an official package, but a few do not.
  7. ^ Openssh 3.4 was the first release included since AIX
  8. ^ Only for jailbroken devices.
  9. ^ Different exploit protection mechanism in use
  10. ^ TinySSH accepts only keys from authorized_keys file, options not supported
  11. ^ TinySSH has similar protection mechanism

References[edit]