BigIP / ASP.NET Webservice Bad Request

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From: Johan Burman (johan.burman_at_sorry.cant.tell.com)
Date: 02/18/05 

Date: Fri, 18 Feb 2005 08:55:01 +0100

Hi all

I got a bit of an odd problem at hand;

Background:

My application consists of a website ("consumer layer") that frequently
communicates with a set of webservices ("service layer"), both based on
ASP.Net. For the time being, the consumer layer and the service layer is
located on the same IIS (running on a Windows Server 2003).

Problem:

Recently, I made an attempt to put this application behind a BigIP box.
When doing this I discovered that several of the webservice requests
resulted in a 401 error. If BigIP was removed, everything went back to
normal.

Extra info:

I did a few dumps of the network traffic between the BigIP box and the
webserver and found that the real response sent from the webserver was
"HTTP/1.1 400 Bad Request", and this only happened with webservices that
had datasets as input parameters. These requests had content lengths in
the region of 40 kB.

After some googling I found that windows 2003 server has a default size
limit on http requests set at 16 kb, and breaking this limit will result
in a bad request... However, if this was the case, how come it works
when not running through the BigIP? Running the consumer and service
layer on separate servers also works just fine. The "Bad request" only
occurs when BigIP is routing the traffic.

Also, the application uses windows authentication...

Any help is appreciated!

//JohanB

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