http://blogs.technet.com/b/dodeitte/archive/2010/12/20/issue-with-lscp-on-standard-edition-with-collocated-mediation-server.aspxThe issue is that you can't get to the Lync Server 2010 Control Panel (LSCP). If you have a Lync Server 2010 Standard Edition Server with collocated Mediation Server using a dedicated IP address, you will run into this issue. In Topology Builder I haveen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.technet.com/b/dodeitte/archive/2010/12/20/issue-with-lscp-on-standard-edition-with-collocated-mediation-server.aspx#3458780Wed, 12 Oct 2011 10:41:06 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3458780GW 999<p>Hi,</p> <p>I had the same issue until I disabled IPv6 on the Std Edition server.</p> <p>Garry</p> <div style="clear:both;"></div><img src="http://blogs.technet.com/aggbug.aspx?PostID=3458780" width="1" height="1">http://blogs.technet.com/b/dodeitte/archive/2010/12/20/issue-with-lscp-on-standard-edition-with-collocated-mediation-server.aspx#3428221Wed, 11 May 2011 15:18:56 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3428221Marc W.<p>Just came across this blog post after resolving this issue due to a different symptom. Just want to note that this may also affect IM conferencing. Our Lync STD FE was showing event ID 33019 - &quot;Lync Server IM MCU failed to connect to the SIP Front End&quot; and would show that it was trying to connect to the IP designated as PSTN interface. After making a host entry with the internal IP only, we resolved both the LSCP issue as well as the IM conferencing issues.</p> <p>Hope this helps someone else</p> <div style="clear:both;"></div><img src="http://blogs.technet.com/aggbug.aspx?PostID=3428221" width="1" height="1">