Lync online unable to login through pidgin on ubuntu 14.04

[Jiewei Yang]

Dear Sir/Madam,
This is Williams from China, I've been suffering from the lync login issue on Ubuntu, can you please help tell the possible reason?
Looking forward your reply!

OS version: Ubuntu desktop 14.04 64bit
Office365: China Version
Lync Server address: sipdir.online.partner.lync.cn:443
Pidgin version: Pidgin 2.10.11 (libpurple 2.10.11)
Error Message: Web ticket request to https://webdir0g.online.partner.lync.cn:443/CertProv/CertProvisioningService.svc failed
(The partner DNS used in the login request cannot be found.)

Regards,
Williams

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