As part of a troubleshooting procedure, you might need to restart a virtual server (that is, stop the server and then immediately start it up again). You can use Communicator Web Access snap-in to do this.
To restart a virtual server
Log on to the computer that is running the Communicator Web Access snap-in. To restart a virtual server, you must log on as a member of the local Administrators group and the RTCUniversalServerAdmins group.
Click Start, point to Administrative Tools, and then click Microsoft Office Communications Server 2007 R2, Communicator Web Access.
In the console tree, expand the name of the computer that hosts the virtual server that you want to restart, right-click the name of the virtual server, and then click Restart.