Single Sign-on Centeral - Probe

Single Sign-on Centeral - Probe

Hi,
i installed 1 central and 2 proble (Windows 2008 r2), the machines are in "Workgroup"
I configured the users to use domain authentication with read-only authentication detail, and it works.
The read-users connect on central for monitoring the alarms, but when they try to connect to the single device, they jump to probe and it prompt again the credential for login to probe.
It's possible no ask credential when users jumps to probe ?
And when they logged into proble ... how can they return to central without to insert again central's url ?

Thk soo much
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