Internal Server Error

I'm sending http post requests using IIS 4.0 to a Siebel Engine and
sporadically receive a 500 Internal Server Error especially when the I
increase the requests from 100 to 500.  Here is the log:

MIME header. Server: Microsoft-IIS/4.0 
MIME header. Date: Tue, 20 Nov 2001 20:54:38 GMT 
Host........ passing 66 bytes as consumed 
Host........ 0 bytes remaining 
MIME........ FREEING.... 
Read Socket. CONTINUE 
HTTP........ Continuing 
Read Socket. WOULD BLOCK fd 356 
Uploading... Flushing 00076DB0 with timer 00076460 
Posting Data Target is SAVED 
Buffer...... Flushing 000767D0 
Write Socket 932 bytes written to 356 
Alert Call.. No entry found for opcode 16 
Uploading... Callback returned 200 
Host Event.. READ passed to `http://xxxxxxx/xxx/xxxx?' 
Read Socket. 923 bytes read from socket 356 
Alert Call.. No entry found for opcode 8 
Host info... New mode is 1 for host 00076BC0 
Host info... 00076BC0 already persistent 
Net Object.. Persistent connection set ON succeeded 
StreamStack. Constructing stream stack for message/rfc822 to www/debug 
Error....... Add  38    Severity: 1     Parameter: `Internal Server Error'
Where: `HTTPNextState' 
Host........ passing 36 bytes as consumed to 0318C338 
Host........ 887 bytes remaining 
MIME header. Server: Microsoft-IIS/4.0 
MIME header. Date: Tue, 20 Nov 2001 20:54:44 GMT 
MIME header. Connection: close 
MIMEParser.. Close received... 
MIME header. Siebel-Error-Symbol-1: Unknown Error Symbol 
MIME header. Siebel-Error-Symbol-2: Unknown Error Symbol 
MIME header. Siebel-Error-Message-1: Error invoking service 'XXXXX', method
'XXXX' at step 'XXXXXXX'. 
MIME header. Siebel-Error-Message-2: Script error occurred in procedure
'XXXXXXX' of object Service [XXXXXXX]: 
Building.... Content-Decoding stack 
Building.... Transfer-Decoding stack 
Host........ passing 402 bytes as consumed to 0318C338 
Host........ 485 bytes remaining 
Read Socket. DIDN'T CONSUME 485 BYTES: `' 
Host........ passing 485 bytes as consumed to 0318C338 
Host........ 0 bytes remaining 
Host Event.. READ passed to `http://mdctxuwiis08/eai/start.swe?' 
Read Socket. FIN received on socket 356 
HTTP Clean.. Called with status -500, net 00076DE0 

Need help ASAP. 

Thanks 

Wendy

Received on Wednesday, 5 December 2001 16:39:43 UTC