Searching forums and web, there are a number of references to this error,
but most are for the 403 whereas the error we receive in the application log is 400.
As mentioned its a tricky one. So far I have verified according to kb docs and others sources.
-OMA vdir is set to basic authentication, domain is set to "our domain". (In fact all of the
relevant vdirs: OMA, exchange-oma, microsoft-server-activesyn
c, Exchange, Exchweb, have been
double checked against an SBS server that does work for authentification and SSL.
-.net framework 1.1.4322.573. Reinstalled: "aspnet_regiis.exe -i". Although one curiousity is that the ASP.NET
tab does not appear on this server.
-ExchangeVDir key is set to the proper exchange-oma vdir
-no host headers on default web site and using the standard ports.
-have re-run the CEICW
-Mobile access IS enabled globally and individually
Error message in log is as follows: Source: MSExchangeOMA, Category:(1000), EventId:1805
Request from user test@BCN.local resulted in the Microsoft(R) Exchange back-end server SERVER1 returning an HTTP error with status code 400
Date: Mon, 10 Jul 2006 09:57:10 GMT