I have Exchange 2010 owa published through TMG and everything works fine, however if i enter an wrong password tmg shows not the normal error page from owa but it shows an page cannot be displayed. In this page it shows the error:
Error Code: 500 Internal Server Error. Logon failure: unknown user name or bad password. (1326)
Which is indeed correct as i typed in a wrong password. Does anyone knows where to look to get the normal login screen back from owa ?
Just to be clear that if i enter an correct username password it works perfectly and the rules test shows all green lights ....