Un processus servant de pool d'applications Classiques .NET AppPool' souffert d'une fatale erreur de communication avec le Service d'Activation des Processus Windows

Je suis en cours d'exécution d'un ASP.NET 3.5 application web sur IIS 7 sur Windows Server 2008.

J'ai reçu l'erreur suivante plus tôt cet après-midi:

HTTP Error 503. The service is unavailable.

J'ai regardé dans les journaux des Événements et découvert que:

A process serving application pool 'Classic .NET AppPool' suffered a fatal communication error with the Windows Process Activation Service. The process id was '3328'. The data field contains the error number.

Voici les détails de cet événement:

Log Name:      System
Source:        Microsoft-Windows-WAS
Date:          18/09/2009 14:58:31
Event ID:      5011
Task Category: None
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      computername
Description:
A process serving application pool 'Classic .NET AppPool' suffered a fatal communication error with the Windows Process Activation Service. The process id was '3328'. The data field contains the error number.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Microsoft-Windows-WAS" Guid="{5 .. 0}" EventSourceName="WAS" />
<EventID Qualifiers="32768">5011</EventID>
<Version>0</Version>
<Level>3</Level>
<Task>0</Task>
<Opcode>0</Opcode>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2009-09-18T13:58:31.000Z" />
<EventRecordID>23552</EventRecordID>
<Correlation />
<Execution ProcessID="0" ThreadID="0" />
<Channel>System</Channel>
<Computer>computername</Computer>
<Security />
</System>
<EventData>
<Data Name="AppPoolID">Classic .NET AppPool</Data>
<Data Name="ProcessID">3328</Data>
<Binary>6D000780</Binary>
</EventData>
</Event>

Ce qui a entraîné l':

Application pool 'Classic .NET AppPool' is being automatically disabled due to a series of failures in the process(es) serving that application pool.

Voici les détails de cet événement:

Log Name:      System
Source:        Microsoft-Windows-WAS
Date:          18/09/2009 15:03:05
Event ID:      5002
Task Category: None
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      computername
Description:
Application pool 'Classic .NET AppPool' is being automatically disabled due to a series of failures in the process(es) serving that application pool.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Microsoft-Windows-WAS" Guid="{5 .. 0}" EventSourceName="WAS" />
<EventID Qualifiers="49152">5002</EventID>
<Version>0</Version>
<Level>2</Level>
<Task>0</Task>
<Opcode>0</Opcode>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2009-09-18T14:03:05.000Z" />
<EventRecordID>23557</EventRecordID>
<Correlation />
<Execution ProcessID="0" ThreadID="0" />
<Channel>System</Channel>
<Computer>computername</Computer>
<Security />
</System>
<EventData>
<Data Name="AppPoolID">Classic .NET AppPool</Data>
<Binary>
</Binary>
</EventData>
</Event>

Finales dans l': Erreur HTTP 503. Le service n'est pas disponible.

Quelqu'un merci de m'aider à identifier comment cela s'est passé et ce que je dois faire pour l'empêcher de se produire dans l'avenir.