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Tom Arbuthnot MVP
Tom Arbuthnot MCSM Communications

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All Posts by Tom Arbuthnot
Tom Arbuthnot is Principal Solutions Architect at Unified Communications specialist Modality Systems. He is a Microsoft Certified Master and MVP, blogger, regular on The UC Architects Podcast, and speaker at events including Microsoft TechEd and Ignite. He co-runs The Microsoft UC User Group London.

Lync Certificate Request Wizard Fails: “The RPC server is unavailable” because Firewall/ISA/TMG site-to-site VPN blocking RPC

Published 29/01/2012 - 7 Comments

While building a fresh Lab server I hit this error on a routine part of the wizard setup: “Command execution failed: Cannot connect to Verify that you can connect to the server, have the appropriate permissions, and that you logged on with the correct credentials.”   Error: The RPC server is unavailable. (Exception from […]

Lync Client Update Jan 2012 4.0.7577.4061 KB2670498

Published 29/01/2012 - 0 Comments

January Lync client update is out. Doesn’t look too exciting Fixes this issue: 2670467  Large increases in load on the OrgID service because of recurring authentication requests from Lync 2010 “You notice that the ADFS server is experiencing larger than expected loads. These loads are more than 40 percent greater than expected. When you examine […]

January 2012 Updates for OCS 2007 R2

Published 23/01/2012 - 0 Comments

Microsoft have released some updates for OCS 2007 R2. Be sure to keep those OCS servers up to date. Communicator Client KB2647093 OCS Group Chat Client KB2647090 OCS 2007 R2 Server KB968802 Office Communications Server 2007 R2, Unified Communications Managed API 2.0 Core KB2647091

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