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Matt WalkerFlag for United States of America

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Skype for Business / Lync 2013 Login Issue

Problem - Lync Phone Edition Error: Can't download certificate because domain is not available (I think this is the message).

Recently upgraded my central system from Lync 2010 to S4B, and am in the process of upgrading my branch office SBAs (AudioCodes Mediant 800s) from Lync 2010 to Lync 2013. All seems to go well until the user tries to sign in after I've finished the update.

Configuring a PIN for the user seems to work (using PIN Authentication on the Lync Phone), client is then prompted that their phone is USB, signs out and back in using the USB method. If we try the USB authentication method from the start it doesn't work. However then PIN authentication seems to work.

Any Ideas?
Avatar of Mohammed Hamada
Mohammed Hamada
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The USB seems to get the local (Internal Certificate) which requires the phone to have the root CA Certificate imported in it in order to work. however the PIN authentication method works automatically by provisioning the certificate using the DHCP option 005 CertProvRelPath which is created after running the Lync script for the Pin Auth.

I would suggest that you check if the root certificate is imported to your phone. I guess your phone does have a mini web server for configuration access?
Avatar of Matt Walker

ASKER

It's a Lync Phone Edition Device - so no web browser.

I did notice that many times the DOMAIN\Username or username@upn.com doesn't work. But username@domain.local (our AD domain name) does work.
Is it HP ? Try to check the log for any errors.. I guess it does have log option
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