(also posted under webdevelopment-inetserver-iis newsgroup, not sure which is
most appropriate)

We have a Windows Forms app that has been successfully running for several
months.  Part of the app checks for certain file updates from a web folder at
login time and downloads any component updates that are needed.  There are
about 15 files of different types that could be downloaded, including .rtf,
.ppt, .xls, .exe and .mdb extensions.

Now they are making us migrate to a new box with a new address.  Only change
I should have to make is the pointer to the web address of the server-based
file.  File names themselves have not changed.

Now when the code runs to check for updates and download needed components
from the new location, the program properly identifies which pieces are
needed, but some of the downloads fail with Error (400) Bad Request, while
others succeed as they used to.  What I have been able to determine is that
the .exe, .mdb, and .rtf files are downloading successfully, while the .xls
and .ppt files are generating the error.

Following is the VB.NET code that executes the individual downloads
(successfully on the old box, only partially successfully on the new box):

Dim RequestAnnouncements As System.Net.HttpWebRequest =
CType(System.Net.WebRequest.Create(cRow.Item("ItemServerLocation") &
cRow.Item("ItemServerFileName")), System.Net.HttpWebRequest)
Dim myCacheAnnouncements As New System.Net.CredentialCache
myCacheAnnouncements.Add(New
Uri("https://our.authenticationservernamegoeshere.com/"), "Basic", New
System.Net.NetworkCredential(strUserID, strUserPassword))
RequestAnnouncements.Credentials = myCacheAnnouncements
RequestAnnouncements.CookieContainer = New System.Net.CookieContainer
httpresponse = RequestAnnouncements.GetResponse()

When this last stmt executes is when the error is thrown (within a Try-Catch
block).

Any idea why some of the files, all from the same folder, are successfully
downloaded while others generate the error?

Thanks for your support!