Secure Socket Tunneling Protocol: Difference between revisions

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{{short description|Form of virtual private network tunnel}}

{{distinguish|Simple Symmetric Transport Protocol}}

{{Infobox technology standard

'''Secure Socket Tunneling Protocol''' ('''SSTP''') is a form of [[virtual private network]] (VPN) tunnel that provides a mechanism to transport [[Point-to-Point Protocol|PPP]] traffic through an [[Transport Layer Security|SSL/TLS]] channel. SSL/TLS provides transport-level security with key negotiation, [[encryption]] and traffic integrity checking. The use of SSL/TLS over [[Transmission Control Protocol|TCP]] port 443 (by default; port can be changed) allows SSTP to pass through virtually all [[firewall (computing)|firewalls]] and [[proxy server]]s except for authenticated web proxies.<ref>{{cite web

| title = SSTP

| long_name = Secure Socket Tunneling Protocol

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| native_name = <!-- Name in local language. If more than one, separate using {{plain list}} -->

| native_name_lang = <!-- ISO 639-1 code e.g. "fr" for French. If more than one, use {{lang}} inside native_name items instead -->

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| year_started = 2007

| first_published = {{Start date|2007|02|22|df=y}}

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| organization = [[Microsoft]]

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| base_standards = MS-SSTP

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| website = <!-- {{URL|https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-sstp/}} -->

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In [[computer networking]], '''Secure Socket Tunneling Protocol''' ('''SSTP''') is a form of [[virtual private network]] (VPN) tunnel that provides a mechanism to transport [[Point-to-Point Protocol]] (PPP) traffic through an [[Transport Layer Security|SSL/TLS]] channel.

==Protocol==

'''Secure Socket Tunneling Protocol''' ('''SSTP''') is a form of [[virtual private network]] (VPN) tunnel that provides a mechanism to transport [[Point-to-Point Protocol|PPP]] traffic through an [[Transport Layer Security|SSL/TLS]] channel. SSL/TLS provides transport-level security with key negotiation, [[encryption]] and traffic integrity checking. The use of SSL/TLS over [[Transmission Control Protocol|TCP]] port 443 (by default; port can be changed) allows SSTP to pass through virtually all [[firewall (computing)|firewalls]] and [[proxy server]]s except for authenticated web proxies.<ref>{{cite web

| url=http://blogs.technet.com/b/rrasblog/archive/2007/01/17/sstp-faq-part-2-client-specific.aspx

| title=SSTP FAQ - Part 2: Client Specific

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SSTP is available for [[Linux]], [[BSD]], and [[Windows]].<ref>{{cite web

| url=httphttps://sstp-client.sourceforge.net/

| title=SSTP-Client

| date=2011-09-17

| accessdate=2015-10-17}}</ref>

SSTP iswas introduced in 2007<ref>{{Cite web |date=2022-11-04 |title=[MS-SSTP]: Secure Socket Tunneling Protocol (SSTP) |url=https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-sstp/c50ed240-56f3-4309-8e0c-1644898f0ea8 |access-date=2024-08-30 |website=learn.microsoft.com |language=en-us}}</ref> and available on [[Windows Vista SP1]] and later, in [[MikroTik|RouterOS]] since version 5.0, and in [[IIJ SEIL|SEIL]] since its firmware version 3.50. It is fully integrated with the RRAS architecture in these operating systems, allowing its use with [[Winlogon]] or [[smart-card]] authentication, remote-access policies and the Windows VPN client.<ref>{{cite web

| url=http://www.biztechmagazine.com/article/2008/01/sstp-makes-secure-remote-access-easier

| title=SSTP Makes Secure Remote Access Easier

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SSTP is intended only for remote client access, it generally does not support site-to-site VPN tunnels.<ref>{{cite web |last=Jain |first=Samir |date=2007-01-10 |title=SSTP FAQ - Part 1: Generic |url=http://blogs.technet.com/b/rrasblog/archive/2007/01/10/sstp-faq-part-1-generic.aspx |url-status=dead |archive-url=https://web.archive.org/web/20101012205841/http://blogs.technet.com/b/rrasblog/archive/2007/01/10/sstp-faq-part-1-generic.aspx |archive-date=2010-10-12 |website=TechNet Blogs |accessdate=}}</ref>

SSTP suffers from the same performance limitations as any other IP-over-TCP tunnel. In general, performance will be acceptable only as long as there is sufficient excess bandwidth on the un-tunneled network link to guarantee that the tunneled TCP timers do not expire. If this becomes untrue, performance falls off dramatically. Thisdue is known asto the "[[TCP meltdown problem"]].<ref>{{cite web

| url=http://sites.inka.de/bigred/devel/tcp-tcp.html

| title=Why TCP Over TCP Is A Bad Idea

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*[https://blogs.technet.microsoft.com/rrasblog/2007/01/10/how-sstp-based-vpn-connection-works/ How SSTP based VPN connection works]

*[http://www.hsc.fr/ressources/outils/sstoper/index.html.en HSC's SSTP Client for Linux]

*[httphttps://sstp-client.sourceforge.net/ SSTP Client for Linux]

{{VPN}}