Topic Last Modified: 2010-12-14
Microsoft Lync Server 2010 communications software requires a public key infrastructure (PKI) to support TLS and mutual TLS (MTLS) connections.
Lync Server 2010 uses certificates for the following purposes:
- TLS connections between client and server
- MTLS connections between servers
- Federation using automatic DNS discovery of partners
- Remote user access for instant messaging (IM)
- External user access to audio/video (A/V) sessions, application
sharing, and conferencing
For Lync Server 2010, the following common requirements apply:
- All server certificates must support server authorization
(Server EKU).
- All server certificates must contain a CRL Distribution Point
(CDP).
- Auto-enrollment is supported for internal servers running Lync
Server.
- Auto-enrollment is not supported for Lync Server Edge
Servers.
- When you submit a web-based certificate request to a Windows
Server 2003 CA, you must submit it from a computer running either
Windows Server 2003 with SP2 or Windows XP.
Note that although KB922706 provides support for resolving issues with enrolling web certificates against a Windows Server 2003 Certificate Services web enrollment, it does not make it possible to use Windows Server 2008, Windows Vista, or Windows 7 to request a certificate from a Windows Server 2003 CA.
- Key lengths of 1024, 2048, and 4096 are supported.
- The default hash algorithm is RSA. The ECDH_P256, ECDH_P384,
and ECDH_P521 hash algorithms are also supported.
