Dear All & Jeff,

If anyone face this problem please let me know. Environment has Polycom CX with win2008 Environment but they have a Branch which is running as an ADC (DNS, DHCP) but it is win2003 32bit, Lync client connecting properly. but CX600 not connecting its says "Cannot download certificate because domain is not accessible" . 

How can i solve this.

 

Connect the CX600 to a PC, with the Lync client installed, using a USB cable. All the authentication and server discovery will happen via the Lync client on the PC.

If this is not possible then I would check that if you are Voice VLANs for the CX600 that you do not have a configuration error.

How about if you use domain FQDN instead of NETBIOS name? i.e. enter user name domain.local\username instead of domain\username

Does that work?

If FQDN works, then you might need to check http://support.polycom.com/global/documents/support/setup_maintenance/products/voice/Polycom_CX700_Deployment_GuideRevA.pdf and search for "domain fqdn" keyword for the NETBIOS configuration

Dear Friends,

i tried by adding to through USB, and also domain\username , but have to try domain.local\username.

Hi Madushka,

Here is another similar post for reference.

And please also check if there is any missing during your deployment. You can follow Jeff’s steps.

Hope helps.

Using domain.local instead of just domain fixed the issue for me: Lync 2013 with Exchange 2010.