We have encountered the following IIS rather 
Web Application Manager (WAM) errors 
in a production install of JServ especially a few hours 
after a heavy usage. These are the errors recorded in
windows NT server 'event viewer'
1) 
---------------
Event ID: 204, Source: WAM, Type: Error, Category: None
The HTTP server encountered an unhandled exception while processing the
ISAPI Application '
 + 0xD820B4F4
'. 
---------------

2)
---------------
Event ID: 204, Source: WAM, Type: Error, Category: None
The HTTP server encountered an unhandled exception while processing the
ISAPI Application '
ntdll!_RtlAllocateHeap@12 + 0x1BE
isapi_redirect!_jk_b_append_int + 0x20
'. 
-----------------------

This error causes IIS to be unresponsive for HTTP requests to be 
handled by the isapi worker. But the static HTML pages and .asp files
are served up fine by IIS

We have the updated NtDll that fixed a bug with deadlocks in a multi
processor server as mentioned in case Q261317 in MS support site


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