There are multiple errors that mention, "Error processing incoming tickle connection. Unable to add socket watcher: Socket is closed." when reviewing the Management Platform logs or the Site Server logs.
Error processing incoming tickle connection.
Unable to add socket watcher: Socket is closed.
[Altiris.DotNetLib.Sockets.SocketClosedException @ Altiris.DotNetLib]
at Altiris.DotNetLib.Sockets.SocketWatchThread.EnsureEntry(Socket socket, SocketEventCallback callback)
at Altiris.ClientTask.Server.RemoteClientTaskManager.OnAcceptClientConnection(Socket newSocket)
Exception logged from:
at Altiris.TaskManagement.Logging.AltirisServerLog.ReportException(Int32, String, String, Exception, String, Object)...
The, "Unable to add socket watcher: Socket is closed." error is coming from the AtrsHost.exe process which communicates with the Management Agents.
To upgrade all the out-of-date Management Agents to the same version as the Management Platform. The agent upgrade policies can be found in the console under: Settings > Agents/Plug-ins > Symantec Management Agent > Windows > Non Site Server.