OMA - unable to connect to your mail server - Application log error eventid:1805 error: 400

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-activesync, 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

Response:
Cache-Control: private
Content-Length: 0
Server: Microsoft-IIS/6.0
MicrosoftSharePointTeamServices: 6.0.2.5530
X-Powered-By: ASP.NET
Public-Extension: http://schemas.microsoft.com/repl-2
Date: Mon, 10 Jul 2006 09:57:10 GMT


Original Request:
Content-Type: text/xml
Depth: 0
Content-Length: 389