Troubleshooting - SOAP don't want receive message

Hello,
we have SOA application that receives messages during web service.
It run on Windows 2003 Server SP1 R2,
IIS 6.0
.NET 2 SP1
Web Service represented like virtual directory in IIS.
When I type WS's link in IE, i get WSDL of it, but when I send message, then "nothing" going.
It working in all servers except the problem one.
There is following function header of reseiving function (we called it Distribute):
[WebMethod()]]
[SoapMethod("our_url")]
public void Distribute([XmlElement(Namespase = "one_more_our_url")] DistributeMessageType DistributeMessage)

Debugger don't reach breakpoints thet were put
(not simple break point and not System.Diagnostics.Debbuger.Launch() )

There nothing in Windows' eventviewer, there is nothing in IIS log in windows\system32

The message we send with small test application.
Again, it works in all servers except the problem one.

One more important thing:
We also use WSE 3.0, but it not matter whether signing is enable or disable.
There is web3 node in web.config that I put in comment, when I disable it.
Again, it is not matter whether signing option disabled or enebled, it simply not work.

Any ideas?