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POA process serving application pool 'Classic .NET AppPool' suffered a fatal communication error with the Windows Process Activation Service
 

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    <p>I am running an ASP.NET 3.5 web application on IIS 7 on Windows Server 2008.</p> <p>I received the following error earlier this afternoon:</p> <p><code>HTTP Error 503. The service is unavailable.</code></p> <p>I looked in the Event logs and discovered that:</p> <p><code>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.</code></p> <p>Here is the full details of that event:</p> <pre><code>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: &lt;Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"&gt; &lt;System&gt; &lt;Provider Name="Microsoft-Windows-WAS" Guid="{5 .. 0}" EventSourceName="WAS" /&gt; &lt;EventID Qualifiers="32768"&gt;5011&lt;/EventID&gt; &lt;Version&gt;0&lt;/Version&gt; &lt;Level&gt;3&lt;/Level&gt; &lt;Task&gt;0&lt;/Task&gt; &lt;Opcode&gt;0&lt;/Opcode&gt; &lt;Keywords&gt;0x80000000000000&lt;/Keywords&gt; &lt;TimeCreated SystemTime="2009-09-18T13:58:31.000Z" /&gt; &lt;EventRecordID&gt;23552&lt;/EventRecordID&gt; &lt;Correlation /&gt; &lt;Execution ProcessID="0" ThreadID="0" /&gt; &lt;Channel&gt;System&lt;/Channel&gt; &lt;Computer&gt;computername&lt;/Computer&gt; &lt;Security /&gt; &lt;/System&gt; &lt;EventData&gt; &lt;Data Name="AppPoolID"&gt;Classic .NET AppPool&lt;/Data&gt; &lt;Data Name="ProcessID"&gt;3328&lt;/Data&gt; &lt;Binary&gt;6D000780&lt;/Binary&gt; &lt;/EventData&gt; &lt;/Event&gt; </code></pre> <p>This resulted in:</p> <p><code>Application pool 'Classic .NET AppPool' is being automatically disabled due to a series of failures in the process(es) serving that application pool.</code></p> <p>Here is the full details of that event:</p> <pre><code>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: &lt;Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"&gt; &lt;System&gt; &lt;Provider Name="Microsoft-Windows-WAS" Guid="{5 .. 0}" EventSourceName="WAS" /&gt; &lt;EventID Qualifiers="49152"&gt;5002&lt;/EventID&gt; &lt;Version&gt;0&lt;/Version&gt; &lt;Level&gt;2&lt;/Level&gt; &lt;Task&gt;0&lt;/Task&gt; &lt;Opcode&gt;0&lt;/Opcode&gt; &lt;Keywords&gt;0x80000000000000&lt;/Keywords&gt; &lt;TimeCreated SystemTime="2009-09-18T14:03:05.000Z" /&gt; &lt;EventRecordID&gt;23557&lt;/EventRecordID&gt; &lt;Correlation /&gt; &lt;Execution ProcessID="0" ThreadID="0" /&gt; &lt;Channel&gt;System&lt;/Channel&gt; &lt;Computer&gt;computername&lt;/Computer&gt; &lt;Security /&gt; &lt;/System&gt; &lt;EventData&gt; &lt;Data Name="AppPoolID"&gt;Classic .NET AppPool&lt;/Data&gt; &lt;Binary&gt; &lt;/Binary&gt; &lt;/EventData&gt; &lt;/Event&gt; </code></pre> <p>Concluding in the: HTTP Error 503. The service is unavailable.</p> <p>Would someone please help me to identify how this happened and what I need to do to prevent it from happening in the future.</p>
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    1. USWalter Lockhart
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    1. COAre you running 32bit or 64bit windows 2008?
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    2. COHi Kev. 64bit Windows 2008.
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    3. COSet IIS to send errors to browser : http://stackoverflow.com/questions/1453791/classic-asp-on-iis7-refusing-to-send-errors-to-browser-on-500-internal-server-er/1455041#1455041
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