Disabling SSL 3.0 in Lync Server 2013 and Skype for Business Server 2015

If you recently tried to check on a certificate on DigiCert – SSL Certificate Checker (https://www.digicert.com/help/), you may have noticed the following warning:   DigiCert added this verification due to a vulnerability that was discovered a few days ago. For more information about this vulnerability, check the following articles: Vulnerability Summary for CVE-2014-3566 http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-3566 This POODLE… Read more

Unable to resolve DNS SRV Record – 404 Not Found and 504 Server time-out

This issue might happen with Skype federation (PIC) or OCS/Lync federation. It’s a simple issue, but directly related to an incorrect configuration that we saw some customers doing. Don’t forget that Lync Server has ports requirement so that federation can work correctly. We can check these requirements on the following TechNet article: Port summary – Single consolidated edge with private… Read more

“No match for domain in DNS SRV results” – Federation to additional SIP Domain

We have to be extra careful when we deal with additional SIP domains and we want these domains to be able to communicate to federated partners. Most of the deployments only have DNS records for the main SIP domain, and because of this the federation for the additional domains won’t work. For example, if we have sip.contoso.com and… Read more

Lync doesn’t generate Address Book files and you receive an error 404 when using the Test-CsAddressBookService cmdlet

Some time ago we got a case where a customer said that the users of a single pool couldn’t download Lync Address Book. The error that the users were receiving was: “Cannot synchronize with the corporate address book because the file could not be found.” When testing with the cmdlet Test-CsAddressBookService, the customer received the… Read more