We have several users that are now running the latest version of Safari 8.0 (Yosemite Release) on their Macs.  When they try to login to Office 365 and they are redirected to our ADFS 3.0 portal the page just seems to ... hang ... and never completes.  Users can switch to Chrome on the Mac and it works as expected.  Is there something within the ADFS configuration or within the Safari (client-side) configuration that needs to be updated?

Thanks in advance...

Hard to tell without traces and your claim configuration. My first bet would be that Safari does not allow large cookies to be sent. Therefore, depending on what you put on the number of claims you have and their size, you might reach the limitation of this browser. You can try to reduce the number of claims (especially the pass-through for the SIDs of all the group the users belongs to... Unless you are actually needing this one...). 

It seems that it is more a Safari issue than a Directory Service issue though...

Thanks for the response.  I too am convinced it is specific to Safari as a browser.  If you run Chrome on the same machine there are no issues.  I can't decide if I should change anything in the ADFS configuration, but rather push back to Apple Safari support.

Hi,

Do you have any progress at the moment?

Best Regards,

Amy

I've had no progress at all.  I've also posted this out on the Apple discussion forums but no responses: https://discussions.apple.com/thread/6612300  I'm not quite sure how to make any inroads into the Apple developers to see if this could come to a resolution.

This fixed most of my issues:  http://blog.kloud.com.au/2014/11/06/implementing-adfs-v3-0-forms-authentication-in-mixed-environments/

I know it's been quite some time since these posts were made but I thought it may be helpful to mention this here.