我在Windows Server 2008的IIS 7上运行一个ASP.NET 3.5 Web应用程序。
今天下午我收到了以下错误：
HTTP错误503. 服务不可用。
我查看了事件日志，并发现：
Classic .NET AppPool应用程序池的一个进程与Windows Process Activation Service之间发生了致命的通信错误。进程ID是'3328'。数据字段包含错误编号。
以下是该事件的完整详细信息：
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>
这导致：
应用程序池“Classic .NET AppPool”由于服务该应用程序池的进程出现一系列故障而被自动禁用。
以下是该事件的完整详细信息：
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>
出现错误：HTTP Error 503. 服务不可用。
请问有人能帮我确定是什么原因导致了这个错误，并告诉我怎样预防它在将来再次发生吗？