Basic troubleshooting begins with making sure the Lync Server services are all running. When services are in a stopped state, users will notice many issues such as being unable to sign in or connect to the Edge Server. Verify that the following services are configured to start automatically and are running.
• Lync Server Access Edge
• Lync Server Audio/Video Authentication
• Lync Server Audio/Video Edge
• Lync Server Replica Replicator Agent
• Lync Server Web Conferencing Edge