Azure AD Connect PW Sync to SSO/PTA

Hi

We have a hybrid exchange 2010 in place using ADconnect for password sync.  We are now looking at migrating our on premise 2010 share point to online but its asking for login every time.  
So would the AD connect pass through work here eliminating this logon problem?  Are there any caveats to not before running the wizard?  I see we have to add two urls to GPO for intranet sites..
https://docs.microsoft.com/en-gb/azure/active-directory/connect/active-directory-aadconnect-pass-through-authentication

Cheers
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CHI-LTDAsked:
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Todd NelsonConnect With a Mentor Systems EngineerCommented:
Seamless single sign-on (SSSO) with pass-through authentication (PTA) has the benefits of AD FS without all of the required servers (only need one).  However, SSSO w PTA still has one large caveat that if the internet connection between your DCs and O365 goes down, then no one is going to be able to login to access the O365 resources.

SSSO with password hash sync is still a great option because it works even if the internet connection between your DCs and O365 goes down.  The recent testing I've done, indicate that it works much more like AD FS and SSSO/PTA than before in that there are no logins or prompts for credentials--it uses the credentials of the currently logged on user.

With that said, both solutions will need to add the following URLs to the local intranet zone of IE or other browsers.


To get this working you will need to ensure you have AAD Connect version 1.1.654.0 (at a minimum).  Then, follow the SSSO Quick Start Guide to either enable SSSO PTA or PHS.

References...
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Vasil Michev (MVP)Commented:
By itself, PTA/SSO will still require users to enter the credentials, and only then the redirect will happen and single-sign on take over. To make the experience seamless, the only solution is to use smart links. As long as you pass the domain_hint or login_hint parameter in the smart link, you should be OK.

In case you need more info about smart links, look here: http://www.enowsoftware.com/solutions-engine/using-smart-links-to-improve-the-login-process-to-office-365-applications
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CHI-LTDAuthor Commented:
So you recommend hash sync or no hash?
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Todd NelsonConnect With a Mentor Systems EngineerCommented:
It depends.  I have read that about 95% of O365 customers use password hash sync.  Personally, I prefer password hash sync because in most cases it is more dynamic than AD FS or PTA in that users can still work with their O365 resources if the internet goes down between AD and O365.
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CHI-LTDAuthor Commented:
Can you have multiple ADconnect boxes at different sites for resiliency?
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Todd NelsonConnect With a Mentor Systems EngineerCommented:
Can you have multiple ADconnect boxes at different sites for resiliency?

No.  Well, you can but they cannot all be actively syncing.  One can actively sync and others could be configured in "staging" mode until you would need them.  But what's the point?  It takes 15 minutes to install and configure; and you could copy the configuration to another server.
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CHI-LTDAuthor Commented:
This is for PTA only right?

We are using Password sync (hash) and SSO.  Its workin gfor for the two urls https://myapps.microsoft.com/contoso.onmicrosoft.com  https://myapps.microsoft.com/contoso.com

However we cannot get the sharepoint url to work without being prompted to cloci kthe users account.  url is https://tenantdomain.sharepoint.com

Ideas?

Other issue is regarding proxy server which, when enabled we get:

IE-

Can’t connect securely to this page

This might be because the site uses outdated or unsafe TLS security settings. If this keeps happening, try contacting the website’s owner.

chrome:
This site can’t provide a secure connectionmyapps.microsoft.com sent an invalid response.Try running Windows Network Diagnostics.ERR_SSL_PROTOCOL_ERROR

Ideas?
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