>>>>>>Hi,
>>>>>>
>>>>>>I am in the process of installing an ASP.NET app on the customer virtual server. When I try to run a simple (one line) test.aspx, I get this message:
>>>>>>
>>>>>>

>>>>>>Error message 401.2.: Unauthorized: Logon failed due to server configuration.  Verify that you have permission to
>>>>>> view this directory or page based on the credentials you supplied and the authentication methods enabled on the
>>>>>> Web server.  Contact the Web server's administrator for additional assistance.
>>>>>>

>>>>>>
>>>>>>What permissions should I be looking at?
>>>>>>
>>>>>>Additional information. This is Server 2008 64-bit.
>>>>>
>>>>>What do you mean be 'virtual server' ?
>>>>>IAC, if this is IIS, it sounds as if anonymous access is not allowed for the page. If you *do* want to allow anonymous access you must either configure for same using IIS manager or specifically allow it in web.config (see configuration/location element for details)
>>>>
>>>>As far as virtual server, I meant that the customer built this server as virtual server. But I don't think it matters, as far as my running my ASP.NET app.
>>>>
>>>>I think (but I will double check) that anonymouse access is enabled. The strange thing (to me) was that I could run a simple .html page in my app without any problem. But when I tried to browse a "hello world" .aspx I was getting this "access denied." So I suppose somewhere (and this is what I am trying to find out) in the Server 2008 IIS there has to be a setting to allow .aspx page to be loaded. Or my appl. I will keep looking. Thank you.
>>>
>>>Do you have access to IIS manager on the target server ?
>>>What version of IIS (I assume IIS 7) ?
>>
>>Yes (I have access to the IIS manager).
>>
>>This is Server 2008 and when I go to IIS and Help -> About. The version is 6.1 (Build 7601: Service Pack 1)
>
>In IIS Manager:
>Navigate to the page you are trying to access. Right click, choose Properties.
>Select 'File Security' tab.
>Click 'Edit' in 'Authentication & Access Control'
>Make sure 'Enable anonymous access' is checked.
>
>If you want to allow anonymous access to the whole site you can do pretty much the same thing at the site level:
>Choose Properties for the site then the 'Directory Security' tab then it's the same as above.....

Thank you. I will save these instructions for the next time I am having a problem. As I mentioned to William, the problem was in my web.config. I don't know which setting, exactly, was causing the issue. But once I replaced it, the pages are accessible.