The problem was solved after turning off friendly error messages.
This is the message I got:
ERROR: 400.100 Bad Request
Source: Microsoft SQL isapi extension
Description: Invalid connection settings: access denied
The error message seems to indicate I am trying to access the SQL
database with a user with no permissions. I have been using the
sysadm-account (sa) to avoid these kinds of conflicts. I thought sa
should have all rigths set?
Well, I changed security settings to "Use Windows Integrated
Authentication", which seemed to do the trick. (I was quite sure I
tried that some days ago, with no luck, but I have tried different
settings, so the problem might have been something else then)
Thanks a lot for the help.
> First I would try turning off friendly error messages in IE (under
> tools/Internet Options/Advanced). This should give you a more defined reason
> for the error. Also in the IIS settings did you check the Allow URL Queries