What is Single Sign-On?
When applied to Terminal Services, Single Sign-On means using the credentials of the currently logged on user (also called default credentials) to log on to a remote computer. If you use the same user name and password logging on to your local computer and connecting to a Terminal Server, enabling Single Sign-On will allow you to do it seamlessly, without having to type in your password again.
Locally logged on credentials are used for connecting to TS Web Access, however, they cannot be shared across TS Web Access and TS or TS Gateway. Thus you will need to enable the Group Policy settings described below in order to use locally logged on credentials for TS or TS Gateway connections.
How to enable Single Sign-On?
Single sign-On can be enabled using domain or local group policy.
What are the limitations when using Single Sign-on?
Why is Single Sign-On controlled by Group Policy?
As a part of the logon process TS Client sends the actual user credentials (user name and password) to the server. If a code running as a regular user were allowed to enable Single Sign-On, any malicious software (virus, Trojan, spyware etc.) running in the user's session would be able to send the user's password to any machine on the network. So, only administrators should be allowed to decide which servers are safe for Single Sign-On.
Thus Single Sign-On can only be enabled on domain-joined client machines.
What if I have Single Sign-On enabled but want to use different credentials this time?
Start TS Client. Click the "Options" button. Select the "Always ask for credentials" checkbox. You will be asked for credentials next time you connect.
How do I enable Single Sign-on for TS Gateway Server?
What if I am connecting from a non-domain joined client machine?
If you have a non-domain client, then you cannot get single sign-on by using locally logon credentials to authenticate with TSG and TS since administrator cannot deploy single sign-on group policies to the non-domain client machines.
Thus, to provide the best connection experience for non-domain clients through TS Gateway, set the option “Use my TS Gateway credentials with remote server option” in RDP file or in the mstsc client advanced setting menu as per screenshot below. This will ensure that end users are prompted for credentials only once during the connection experience.
No. Unfortunately if a Smart Card is used to log on locally to the machine, these credentials cannot be used for Single Sign-On. Please also note that you cannot save Smart Card credentials in TS connections either.
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