Hello,

In one of my sessions on site I found an interesting issue with when publishing flash based web application for upload files, basically it's a bug but I found a workaround that works great

The customer used www.uploadify.com in my case, these are the links:

1. /resources/scripts/uploadify.swf
2. POST /resources/scripts/Upload.ashx

After debugging this error I found the following:

ERROR: From WhyFilSecureRemote.dll return WFE STATUS ERROR, (ExtECB=00000000054AB460), (PFC=00000000071914CB)

ERRORfailed returning ERROR status <523>, (ExtECB=00000000054AB460), (PFC=00000000071914CB)

ERROR: Unexpected error 523, completing request, (ExtECB=00000000054AB460), (PFC=00000000071914CB)

[0]1920.15d4 02/16/2012-17:18:30.077ERROR:multipart format data not valid

I talked with Microsoft and they told that this is a bug and they are not going to fix it … I said no way! I'm not leaving my customer at this situation, it was a production environment

So I started researching this issue and finally I found this workaround

The workaround:

In the advanced trunk configuration you need to configure:

1. In the URLs without body parsing in the request
   1. you need to add the server IP/Name that you used in the application you published (in regex)
   2. you need to add the specific URL that is responsible for uploading the files

1. In the URLs without body parsing in the response
   1. you need to add the specific URL that is responsible for uploading the files under the localhost

HTH

Idan Plotnik

Forefront MVP

Foreity – Intelligent Security