SWFUpload uppload error 500 - asp.net website

I have a asp.net website where I am using the Flash SWFUpload (http://code.google.com/p/swfupload/) upload component.

The same code is hosted on two servers - on server A I can upload images without any problems. On server B I get Error 500 when I try to upload - no other error message.

I am unable to find what server settings are different between those two servers.开发者_运维技巧 I cant find any solution on SWFUpload forum.

Any idea what could be the issue?

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I had a similiar problem using an apache httpd server
fixed it using an answer from SWFUpload forum.

hope it will help.

short version:
append

SecFilterEngine Off
SecFilterScanPOST Off

to .htaccess in root.

Also I want to comment that this is less secure.