This morning (and last monday morning), all users cannot use their computer
due to ZCM server busy.
They enter their network credentials and then, nothing...
In the zmd-messages.log on the local computer, I have this:

[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [FindFirstContent()] []
[]
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [ ] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] []
[https://hercules.cegeplapocatiere.qc...n/registration
] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] []
[https://10.0.70.8/zenworks-registration/registration ] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [ ] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [ Found host
hercules.cegeplapocatiere.qc.ca status: Busy] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [ Skipping IP address
10.0.70.8, status Busy] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [ Found host 10.0.70.8
status: Busy] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [ Skipping IP address
10.0.70.8, status Busy] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [Trying to locate source
location:
https://hercules.cegeplapocatiere.qc.../registration]
[] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [ Host name to resolve:
hercules.cegeplapocatiere.qc.ca] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [ Found host:
hercules.cegeplapocatiere.qc.ca, status: Busy] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [ Host:
hercules.cegeplapocatiere.qc.ca, IP address: 10.0.70.8] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [ Skipping Busy IP
address 10.0.70.8] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [Marking location
hercules.cegeplapocatiere.qc.ca Busy at the request of module registration]
[] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [ Setting location name
hercules.cegeplapocatiere.qc.ca to status Busy] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [ Setting host
hercules.cegeplapocatiere.qc.ca status: Busy] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [Trying to locate source
location: https://10.0.70.8/zenworks-registration/registration] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [ Host name to resolve:
10.0.70.8] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [ Found host:
10.0.70.8, status: Busy] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [ Host: 10.0.70.8, IP
address: 10.0.70.8] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [ Skipping Busy IP
address 10.0.70.8] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [Marking location
10.0.70.8 Busy at the request of module registration] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [ Setting location name
10.0.70.8 to status Busy] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [ Setting host
10.0.70.8 status: Busy] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [Entered
FindServerFromBusyList] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [
FindServerFromBusyList() Found host: hercules.cegeplapocatiere.qc.ca,
status: Busy] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [ IP address
10.0.70.8 marked Busy] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [GetGoodOrBusyIp()
returning 10.0.70.8] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [
FindServerFromBusyList() Using location:
https://10.0.70.8/zenworks-registration/registration, status: Busy] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [Exited
FindServerFromBusyList with server
https://10.0.70.8/zenworks-registration/registration] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [FindFirstContent()
returning https://10.0.70.8/zenworks-registration/registration] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [FindNextContent:
Exiting with content https://10.0.70.8/zenworks-registration/registration]
[] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ZMD] [] [GetCurrentURIFromConnectMan -
New uri is: https://10.0.70.8/zenworks-registration/registration] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ZenCache] [] [GetObject called for
PROXY_OVERRIDE] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ZenCache] [] [GetObject called for
PROXY_DEFAULT] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ZenService] [] [Registering device] []
[]
[DEBUG] [5/12/2008 8:24:26 AM] [] [RegistrationManager] [] [Unexpected
exception calling registration soap service: La connexion sous-jacente a t
ferme : Une erreur inattendue s'est produite lors de l'envoi.] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ZMD] [] [GetCurrentURIFromConnectMan -
URI is bad https://10.0.70.8/zenworks-registration/registration trying to
find another one] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [FindNextContent()] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [ badUri:
https://10.0.70.8/zenworks-registration/registration] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [ Exception: La
connexion sous-jacente a t ferme : Une erreur inattendue s'est produite
lors de l'envoi.] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [ ] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] []
[https://hercules.cegeplapocatiere.qc...n/registration
] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] []
[https://10.0.70.8/zenworks-registration/registration ] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [ ] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [WebException: La
connexion sous-jacente a t ferme : Une erreur inattendue s'est produite
lors de l'envoi.] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [Status: SendFailure] []
[]
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [ Setting IP location
https://10.0.70.8/zenworks-registration/registration to retries 14] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [Received busy response
from server, setting retry count to 14] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [MarkServerBusy called
for https://10.0.70.8/zenworks-registration/registration, exception
System.Net.WebException: La connexion sous-jacente a t ferme : Une erreur
inattendue s'est produite lors de l'envoi. ---> System.IO.IOException:
Impossible de lire les donnes de la connexion de transport : Une connexion
existante a d tre ferme par l'hte distant. --->
System.Net.Sockets.SocketException: Une connexion existante a d tre ferme
par l'hte distant
System.Net.Sockets.Socket.Receive(Byte[[]] buffer, Int32 offset, Int32
size, SocketFlags socketFlags)
System.Net.Sockets.NetworkStream.Read(Byte[[]] buffer, Int32 offset,
Int32 size)
--- Fin de la trace de la pile d'exception interne ---
System.Net.Sockets.NetworkStream.Read(Byte[[]] buffer, Int32 offset,
Int32 size)
System.Net.FixedSizeReader.ReadPacket(Byte[[]] buffer, Int32 offset,
Int32 count)
System.Net.Security.SslState.StartReceiveBlob(Byte[[]] buffer,
AsyncProtocolRequest asyncRequest)

System.Net.Security.SslState.CheckCompletionBefore NextReceive(ProtocolToken
message, AsyncProtocolRequest asyncRequest)
System.Net.Security.SslState.StartSendBlob(Byte[[]] incoming, Int32
count, AsyncProtocolRequest asyncRequest)
System.Net.Security.SslState.ForceAuthentication(B oolean receiveFirst,
Byte[[]] buffer, AsyncProtocolRequest asyncRequest)
System.Net.Security.SslState.ProcessAuthentication (LazyAsyncResult
lazyResult)
System.Net.TlsStream.CallProcessAuthentication(Obj ect state)
System.Threading.ExecutionContext.runTryCode(Objec t userData)

System.Runtime.CompilerServices.RuntimeHelpers.Exe cuteCodeWithGuaranteedCleanup(TryCode
code, CleanupCode backoutCode, Object userData)
System.Threading.ExecutionContext.RunInternal(Exec utionContext
executionContext, ContextCallback callback, Object state)
System.Threading.ExecutionContext.Run(ExecutionCon text
executionContext, ContextCallback callback, Object state)
System.Net.TlsStream.ProcessAuthentication(LazyAsy ncResult result)
System.Net.TlsStream.Write(Byte[[]] buffer, Int32 offset, Int32 size)
System.Net.PooledStream.Write(Byte[[]] buffer, Int32 offset, Int32
size)
System.Net.ConnectStream.WriteHeaders(Boolean async)
--- Fin de la trace de la pile d'exception interne ---

System.Web.Services.Protocols.WebClientProtocol.Ge tWebResponse(WebRequest
request)

System.Web.Services.Protocols.HttpWebClientProtoco l.GetWebResponse(WebRequest
request)
System.Web.Services.Protocols.SoapHttpClientProtoc ol.Invoke(String
methodName, Object[[]] parameters)

Novell.Zenworks.Registration.Schema.RegistrationSe rvice.registerDevice(RegisterRequest
RegisterRequest)

Novell.Zenworks.Registration.RegistrationManager.C allDeviceRegistrationService(String
uri, RegisterRequestDeviceInformation info, Boolean tryNewGuid)

Novell.Zenworks.Registration.RegistrationManager.R egisterDevice(IService[[]]
services, String key, String data)] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [Marking location
https://10.0.70.8/zenworks-registration/registration Busy at the request of
module registration] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [ Setting location name
https://10.0.70.8/zenworks-registration/registration to status Busy] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [ Exception causing
location name https://10.0.70.8/zenworks-registration/registration to be
marked Busy: System.Net.WebException: La connexion sous-jacente a t ferme
: Une erreur inattendue s'est produite lors de l'envoi. --->
System.IO.IOException: Impossible de lire les donnes de la connexion de
transport : Une connexion existante a d tre ferme par l'hte
distant. ---> System.Net.Sockets.SocketException: Une connexion existante a
d tre ferme par l'hte distant
System.Net.Sockets.Socket.Receive(Byte[[]] buffer, Int32 offset, Int32
size, SocketFlags socketFlags)
System.Net.Sockets.NetworkStream.Read(Byte[[]] buffer, Int32 offset,
Int32 size)
--- Fin de la trace de la pile d'exception interne ---
System.Net.Sockets.NetworkStream.Read(Byte[[]] buffer, Int32 offset,
Int32 size)
System.Net.FixedSizeReader.ReadPacket(Byte[[]] buffer, Int32 offset,
Int32 count)
System.Net.Security.SslState.StartReceiveBlob(Byte[[]] buffer,
AsyncProtocolRequest asyncRequest)

System.Net.Security.SslState.CheckCompletionBefore NextReceive(ProtocolToken
message, AsyncProtocolRequest asyncRequest)
System.Net.Security.SslState.StartSendBlob(Byte[[]] incoming, Int32
count, AsyncProtocolRequest asyncRequest)
System.Net.Security.SslState.ForceAuthentication(B oolean receiveFirst,
Byte[[]] buffer, AsyncProtocolRequest asyncRequest)
System.Net.Security.SslState.ProcessAuthentication (LazyAsyncResult
lazyResult)
System.Net.TlsStream.CallProcessAuthentication(Obj ect state)
System.Threading.ExecutionContext.runTryCode(Objec t userData)

System.Runtime.CompilerServices.RuntimeHelpers.Exe cuteCodeWithGuaranteedCleanup(TryCode
code, CleanupCode backoutCode, Object userData)
System.Threading.ExecutionContext.RunInternal(Exec utionContext
executionContext, ContextCallback callback, Object state)
System.Threading.ExecutionContext.Run(ExecutionCon text
executionContext, ContextCallback callback, Object state)
System.Net.TlsStream.ProcessAuthentication(LazyAsy ncResult result)
System.Net.TlsStream.Write(Byte[[]] buffer, Int32 offset, Int32 size)
System.Net.PooledStream.Write(Byte[[]] buffer, Int32 offset, Int32
size)
System.Net.ConnectStream.WriteHeaders(Boolean async)
--- Fin de la trace de la pile d'exception interne ---

System.Web.Services.Protocols.WebClientProtocol.Ge tWebResponse(WebRequest
request)

System.Web.Services.Protocols.HttpWebClientProtoco l.GetWebResponse(WebRequest
request)
System.Web.Services.Protocols.SoapHttpClientProtoc ol.Invoke(String
methodName, Object[[]] parameters)

Novell.Zenworks.Registration.Schema.RegistrationSe rvice.registerDevice(RegisterRequest
RegisterRequest)

Novell.Zenworks.Registration.RegistrationManager.C allDeviceRegistrationService(String
uri, RegisterRequestDeviceInformation info, Boolean tryNewGuid)

Novell.Zenworks.Registration.RegistrationManager.R egisterDevice(IService[[]]
services, String key, String data)] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [ Setting IP location
https://10.0.70.8/zenworks-registration/registration to retries 15] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [Marking location
10.0.70.8 Busy at the request of module registration] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [ Setting location name
10.0.70.8 to status Busy] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [ Exception causing
location name 10.0.70.8 to be marked Busy: System.Net.WebException: La
connexion sous-jacente a t ferme : Une erreur inattendue s'est produite
lors de l'envoi. ---> System.IO.IOException: Impossible de lire les donnes
de la connexion de transport : Une connexion existante a d tre ferme par
l'hte distant. ---> System.Net.Sockets.SocketException: Une connexion
existante a d tre ferme par l'hte distant
System.Net.Sockets.Socket.Receive(Byte[[]] buffer, Int32 offset, Int32
size, SocketFlags socketFlags)
System.Net.Sockets.NetworkStream.Read(Byte[[]] buffer, Int32 offset,
Int32 size)
--- Fin de la trace de la pile d'exception interne ---
System.Net.Sockets.NetworkStream.Read(Byte[[]] buffer, Int32 offset,
Int32 size)
System.Net.FixedSizeReader.ReadPacket(Byte[[]] buffer, Int32 offset,
Int32 count)
System.Net.Security.SslState.StartReceiveBlob(Byte[[]] buffer,
AsyncProtocolRequest asyncRequest)

System.Net.Security.SslState.CheckCompletionBefore NextReceive(ProtocolToken
message, AsyncProtocolRequest asyncRequest)
System.Net.Security.SslState.StartSendBlob(Byte[[]] incoming, Int32
count, AsyncProtocolRequest asyncRequest)
System.Net.Security.SslState.ForceAuthentication(B oolean receiveFirst,
Byte[[]] buffer, AsyncProtocolRequest asyncRequest)
System.Net.Security.SslState.ProcessAuthentication (LazyAsyncResult
lazyResult)
System.Net.TlsStream.CallProcessAuthentication(Obj ect state)
System.Threading.ExecutionContext.runTryCode(Objec t userData)

System.Runtime.CompilerServices.RuntimeHelpers.Exe cuteCodeWithGuaranteedCleanup(TryCode
code, CleanupCode backoutCode, Object userData)
System.Threading.ExecutionContext.RunInternal(Exec utionContext
executionContext, ContextCallback callback, Object state)
System.Threading.ExecutionContext.Run(ExecutionCon text
executionContext, ContextCallback callback, Object state)
System.Net.TlsStream.ProcessAuthentication(LazyAsy ncResult result)
System.Net.TlsStream.Write(Byte[[]] buffer, Int32 offset, Int32 size)
System.Net.PooledStream.Write(Byte[[]] buffer, Int32 offset, Int32
size)
System.Net.ConnectStream.WriteHeaders(Boolean async)
--- Fin de la trace de la pile d'exception interne ---

System.Web.Services.Protocols.WebClientProtocol.Ge tWebResponse(WebRequest
request)

System.Web.Services.Protocols.HttpWebClientProtoco l.GetWebResponse(WebRequest
request)
System.Web.Services.Protocols.SoapHttpClientProtoc ol.Invoke(String
methodName, Object[[]] parameters)

Novell.Zenworks.Registration.Schema.RegistrationSe rvice.registerDevice(RegisterRequest
RegisterRequest)

Novell.Zenworks.Registration.RegistrationManager.C allDeviceRegistrationService(String
uri, RegisterRequestDeviceInformation info, Boolean tryNewGuid)

Novell.Zenworks.Registration.RegistrationManager.R egisterDevice(IService[[]]
services, String key, String data)] [] []
[DEBUG] [5/12/2008 8:24:26 AM] [] [ConnectMan] [] [FindNextContent:
Sleeping 16000ms] [] []

Anybody can help me about this ?
Thanks.