When the customer accesses the Symantec Management Console (SMC), they get the message "Service Unavailable".
Note: Many other things were also not working too.
And, the Altiris logs had messages such as the following:
Priority: 2 Host Name: ServerName Process: AtrsHost (1912) Thread ID: 3 Module: AtrsHost.exe Source: Altiris.TaskManagement.ClientTask.* Description: NotificationServerWebConnection.FigureOutCredentials(): Credentials in Agent registry were invalid, or there was an error connecting to the server.
Description: NotificationServerWebConnection::CheckCredentials(): Credential check for "altirissvc" failed: System.Net.WebException: The remote server returned an error: (503) Server Unavailable. at System.Net.HttpWebRequest.GetResponse() at Altiris.ClientTask.Server.Communication.NotificationServerWebConnection.PostToNotificationServer(String url, ICredentials credentials, NSWebConnectionBuildRequestStreamDelegate requestStreamDelegate, Int32 nMaxAttempts, Int32 nTimeout) at Altiris.ClientTask.Server.Communication.NotificationServerWebConnection.PostToNotificationServer(String url, NetworkCredential credentials, String postData, Int32 nMaxAttempts, Int32 nTimeout) at Altiris.ClientTask.Server.Communication.NotificationServerWebConnection.CheckCredentials(NetworkCredential credentials)
DefaultAppPool is stopped.
Start the DefaultAppPool.
Launch IIS manager
Start > Administrative Tools > Internet Information Services (IIS) Manager