WSUS 3.0 suddenly not displaying computers

[Steve W]

After starting WSUS snap-in, no computers are displayed. Under Actions,
Connect to Server, I choose port 80 and get the following message:

"cannot connect to <server>. The server may be using another port or
different secure sockets layer setting. "

Checked event view and found below:

Event Type: Error
Event Source: Windows Server Update Services
Event Category: None
Event ID: 7053
Date: 8/15/2008
Time: 11:35:32 AM
User: N/A
Computer: SSP-MGMTSVR
Description:
The WSUS administration console has encountered an unexpected error. This
may be a transient error; try restarting the administration console. If this
error persists,

Try removing the persisted preferences for the console by deleting the wsus
file under %appdata%\Microsoft\MMC\.


System.NullReferenceException -- Object reference not set to an instance of
an object.

Source
Microsoft.UpdateServices.UI.SnapIn

Stack Trace:
at
Microsoft.UpdateServices.UI.SnapIn.Scope.ServerSummaryScopeNode.ResetScopeNode()

Note: I tried deleting the wsus file as suggested above. No luck.

Then:

Event Type: Warning
Event Source: Windows Server Update Services
Event Category: None
Event ID: 7032
Date: 8/15/2008
Time: 11:35:38 AM
User: N/A
Computer: SSP-MGMTSVR
Description:
The WSUS administration console was unable to connect to the WSUS Server via
the remote API.

Verify that the Update Services service, IIS and SQL are running on the
server. If the problem persists, try restarting IIS, SQL, and the Update
Services Service.

The WSUS administration console has encountered an unexpected error. This
may be a transient error; try restarting the administration console. If this
error persists,

Try removing the persisted preferences for the console by deleting the wsus
file under %appdata%\Microsoft\MMC\.


System.IO.IOException -- The handshake failed due to an unexpected packet
format.

Source
System

Stack Trace:
at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32
readBytes, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer,
AsyncProtocolRequest asyncRequest)
at
System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken
message, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32
count, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst,
Byte[] buffer, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult
lazyResult)
at System.Net.TlsStream.CallProcessAuthentication(Object state)
at System.Threading.ExecutionContext.runTryCode(Object userData)
at
System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext
executionContext, ContextCallback callback, Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext
executionContext, ContextCallback callback, Object state)
at System.Net.TlsStream.ProcessAuthentication(LazyAsyncResult result)
at System.Net.TlsStream.Write(Byte[] buffer, Int32 offset, Int32 size)
at System.Net.PooledStream.Write(Byte[] buffer, Int32 offset, Int32 size)
at System.Net.ConnectStream.WriteHeaders(Boolean async)
** this exception was nested inside of the following exception **


System.Net.WebException -- The underlying connection was closed: An
unexpected error occurred on a send.

Source
Microsoft.UpdateServices.Administration

Stack Trace:
at
Microsoft.UpdateServices.Administration.AdminProxy.CreateUpdateServer(Object[] args)
at
Microsoft.UpdateServices.Administration.AdminProxy.GetUpdateServer(String
serverName, Boolean useSecureConnection, Int32 portNumber)
at
Microsoft.UpdateServices.UI.AdminApiAccess.AdminApiTools.GetUpdateServer(String serverName, Boolean useSecureConnection, Int32 portNumber)
at
Microsoft.UpdateServices.UI.SnapIn.Scope.ServerSummaryScopeNode.GetUpdateServer(PersistedServerSettings settings)
at
Microsoft.UpdateServices.UI.SnapIn.Scope.ServerSummaryScopeNode.ConnectToServer()
at
Microsoft.UpdateServices.UI.SnapIn.Scope.ServerSummaryScopeNode.get_ServerTools()

For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.

No changes have been made to server settings, IIS, etc.

Note: I did verify update services, IIS and SQL services are running.

Thanks in advance for any assistance you can provide.