400 Bad Request problem

Hi,

Not sure this is the right place to ask, since the issue is not with
IIS.
We develop an application in .NET that hosts web services using
HttpListener.
The application has already been deployed succesfully, but this week,
we had an issue when installing at a new customer site. Occasionally
we get "400 Bad Request" errors. The odd thing is, the very same
binaries run just fine at another customers' site.
We did some tests at our offices, and found the following:
- everything works fine when hosting our webservice in IIS 6.0 on
Windows 2003 R2 SP2
- we get "400 Bad Request" errors when hosting the webservice
ourselves on Windows 2003 R2 SP2

The errors occur more or less erratic - so not every time - and, the
most annoying thing : they _don't_ show up in the httperr log files.

For now we've been looking with wireshark what could be the reason of
the "400 Bad Request" errors, but for two identical (byte by byte
compared) requests, one is accepted, while the other is rejected. In
our webservice, the rejected call (logicallly) is undetectable.

We will now compare what is sent over the wire when hosting in IIS
compared to hosting the web service ourselves, but meanwhile, I would
really appreciate some hints, tips or suggestions on what is going on
here.

Why does http.sys (we believe) sometimes reject messages when we host
the webservice, and (up to now) never rejects
it when IIS hosts it ?

Thanks in advance,

Joris Spriet
MESware nv

On 14 feb, 19:38, "joris.spr...@gmail.com" <joris.spr... DeleteThis @gmail.com>
wrote:
> Hi,
>
> Not sure this is the right place to ask, since the issue is not with
> IIS.
> We develop an application in .NET that hosts web services using
> HttpListener.
> The application has already been deployed succesfully, but this week,
> we had an issue when installing at a new customer site. Occasionally
> we get "400 Bad Request" errors. The odd thing is, the very same
> binaries run just fine at another customers' site.
> We did some tests at our offices, and found the following:
> - everything works fine when hosting our webservice in IIS 6.0 on
> Windows 2003 R2 SP2
> - we get "400 Bad Request" errors when hosting the webservice
> ourselves on Windows 2003 R2 SP2
>
> The errors occur more or less erratic - so not every time - and, the
> most annoying thing : they _don't_ show up in the httperr log files.
>
> For now we've been looking with wireshark what could be the reason of
> the "400 Bad Request" errors, but for two identical (byte by byte
> compared) requests, one is accepted, while the other is rejected. In
> our webservice, the rejected call (logicallly) is undetectable.
>
> We will now compare what is sent over the wire when hosting in IIS
> compared to hosting the web service ourselves, but meanwhile, I would
> really appreciate some hints, tips or suggestions on what is going on
> here.
>
> Why does http.sys (we believe) sometimes reject messages when we host
> the webservice, and (up to now) never rejects
> it when IIS hosts it ?
>
> Thanks in advance,
>
> Joris Spriet
> MESware nv

For any one who might be interested : think we managed to fix it
(http://forums.microsoft.com/MSDN/ShowPost.aspx?
PostID=2850183&SiteID=1)

Joris Spriet
MESware nv