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Yahoo!’s certificate for lcsap.msg.yahoo.com expired. This caused traffic sent to Yahoo! to be rejected by their edge servers. If you have experienced PIC Federation issues with Yahoo! users due to certificates, please read this article.
Author: Quincy Davis, Microsoft Senior Support Engineer
Editor: Susan S. Bradley
Publication date: April 4, 2013
Product version: Lync Server 2013, Lync Server 2010, Office Communications Server
Yahoo!’s certificate for lcsap.msg.yahoo.com expired. This caused traffic sent to Yahoo! to be rejected by their edge servers.
The solution is to obtain a new certificate with the required level of security, which is higher than the old certificate (2048bit versus 1024bit). After in place on Yahoo!’s edge servers, Yahoo! can receive traffic again. Further testing and parsing of log data indicates that at least for most of Microsoft's customers, no further action is required to use the new certificates.
If the IM & Presence function is not working properly with your federated Yahoo! users due to certificates, you should install the following 2048 bit certificates on your edge servers: DigiCert High Assurance EV Root CA and DigiCert High Assurance CA-3.
After installing these certificates on your edge server, communication between your users and Yahoo! should resume. If this does not resolve the issue, you may be encountering another problem entirely.
Keywords: Lync, Yahoo, Federation, PIC