WebClient & Proxy (407 Proxy authentication required)

**Chris Podmore** · Nov 21 '05, 07:10 AM

RE: WebClient & Proxy (407 Proxy authentication required)

I have tried your sample code here at work and I get the 407 as well. I think
you are going to have to specify the proxy setting, I don't know of anyway
round this.

Try:

Dim proxyObject As New System.Net.WebP roxy("http://999.999.999.999 :9999",
True)
obj_HTTPWebRequ est.Proxy = proxyObject
obj_HTTPWebRequ est.Proxy.Crede ntials =
System.Net.Cred entialCache.Def aultCredentials

Replace 999.999.999.999 :9999 with your proxy IP address and port number.

Hope this helps.
Chris.

"Morten Snedker" wrote:
[color=blue]
> I'm trying to download a file. I've tried both using webclient and the
> httpWebRequest. Either way it returns a "407 proxy authentication
> required".
>
> The program is to be run externally, so basically I don't know the
> users login-name, password or domain. So that makes setting the proxy
> in code irrelevant, doesn't it?
>
> When searching the web it appears to be a common problem. But I
> haven't found my solution and still can't get it to work...
>
> This the code I'm trying to execute:
>
> '---
> Function DownloadVersion File() As Boolean
>
> LocalVersionfil e = Application.Exe cutablePath
> LocalVersionfil e = LocalVersionfil e.Substring(0,
> LocalVersionfil e.Length - 19) & "vk.txt"
>
> Dim wctl As New WebClient
> Try
> wctl.DownloadFi le(versionFile, LocalVersionfil e)
> DownloadVersion File = True
> Catch ex As Exception
> MsgBox(ex.Messa ge, MsgBoxStyle.Exc lamation, "Fejl i
> DownloadVersion File")
> DownloadVersion File = False
> End Try
>
> End Function
> '----
>
>
> Another part of my code that fails with same error:
>
>
> '---
> Dim myURI As Uri, url As String
>
> url = FileToDownload( )
> myURI = New Uri(url)
>
> Try
> Dim obj_HTTPWebRequ est As HttpWebRequest =
> CType(HttpWebRe quest.Create(ur l), HttpWebRequest)
> obj_HTTPWebRequ est.Credentials =
> CredentialCache .DefaultCredent ials
> Dim obj_HTTPWebResp onse As HttpWebResponse =
> obj_HTTPWebRequ est.GetResponse ()
> lFileSize = (obj_HTTPWebRes ponse.ContentLe ngth)
> Catch ex As Exception
> MsgBox(Err.Numb er)
> MsgBox(ex.Messa ge, MsgBoxStyle.Exc lamation, "Fejl i
> DownloadNewVers ionFile")
> Application.Exi t()
> End Try
>
> '---
>
>
> Thx in advance!
>
> Regards /Snedker
>[/color]

**Morten Snedker** · Nov 21 '05, 07:10 AM

Re: WebClient & Proxy (407 Proxy authentication required)

On Thu, 25 Nov 2004 01:33:05 -0800, "Chris Podmore"
<ChrisPodmore@d iscussions.micr osoft.com> wrote:

First of all, thanks for your help so far. I've gotten a bit further
since now I don't get any errors back from the server.

But...it just won't download the file. If I run it at home it works
fine, but from work through ISA and proxy, it doesn't.

I've tried setting the proxy explicitly with
Dim proxyObject As New System.Net.WebP roxy("http://PICASSO:8080",
True), but this doesn't help either.

Trying to read the filesize with ContentLength, -1 is returned. This
is the code:

Dim myURI As Uri, url As String
url = versionFile
myURI = New Uri(url)

LocalVersionfil e = Application.Exe cutablePath
LocalVersionfil e = LocalVersionfil e.Substring(0,
LocalVersionfil e.Length - 19) & "vk.txt"

Try
Dim proxyObject As New WebProxy
proxyObject.Get DefaultProxy()

Dim obj_HTTPWebRequ est As HttpWebRequest =
CType(HttpWebRe quest.Create(ur l), HttpWebRequest)

With obj_HTTPWebRequ est
.Proxy = proxyObject
.Proxy.Credenti als =
CredentialCache .DefaultCredent ials()
Dim obj_HTTPWebResp onse As HttpWebResponse =
..GetResponse()
lFileSize = (.ContentLength )
End With

Catch ex As Exception
MsgBox(ex.Messa ge)
Application.Exi t()
End Try

MsgBox("Filesiz e: " & lFileSize)

Thanks again. Your help is greatly appreciated!

/Snedker

**Chris Podmore** · Nov 21 '05, 07:10 AM

Re: WebClient & Proxy (407 Proxy authentication required)

I'm at a bit of a loss as to what your problem is now. We have ISA etc and
the following code works fine for me.

Sorry I can't be more help.
Chris.

Dim url As String = "http://www.microsoft.c om"
Dim obj_HTTPWebRequ est As HttpWebRequest = CType(HttpWebRe quest.Create(ur l),
HttpWebRequest)

'Remove these two lines to get 407 error
obj_HTTPWebRequ est.Proxy = System.Net.WebP roxy.GetDefault Proxy
obj_HTTPWebRequ est.Proxy.Crede ntials =
System.Net.Cred entialCache.Def aultCredentials

Dim r As WebResponse = obj_HTTPWebRequ est.GetResponse ()

MsgBox(r.Conten tLength.ToStrin g)

"Morten Snedker" wrote:
[color=blue]
> On Thu, 25 Nov 2004 01:33:05 -0800, "Chris Podmore"
> <ChrisPodmore@d iscussions.micr osoft.com> wrote:
>
> First of all, thanks for your help so far. I've gotten a bit further
> since now I don't get any errors back from the server.
>
> But...it just won't download the file. If I run it at home it works
> fine, but from work through ISA and proxy, it doesn't.
>
> I've tried setting the proxy explicitly with
> Dim proxyObject As New System.Net.WebP roxy("http://PICASSO:8080",
> True), but this doesn't help either.
>
> Trying to read the filesize with ContentLength, -1 is returned. This
> is the code:
>
> Dim myURI As Uri, url As String
> url = versionFile
> myURI = New Uri(url)
>
> LocalVersionfil e = Application.Exe cutablePath
> LocalVersionfil e = LocalVersionfil e.Substring(0,
> LocalVersionfil e.Length - 19) & "vk.txt"
>
> Try
> Dim proxyObject As New WebProxy
> proxyObject.Get DefaultProxy()
>
> Dim obj_HTTPWebRequ est As HttpWebRequest =
> CType(HttpWebRe quest.Create(ur l), HttpWebRequest)
>
> With obj_HTTPWebRequ est
> .Proxy = proxyObject
> .Proxy.Credenti als =
> CredentialCache .DefaultCredent ials()
> Dim obj_HTTPWebResp onse As HttpWebResponse =
> ..GetResponse()
> lFileSize = (.ContentLength )
> End With
>
> Catch ex As Exception
> MsgBox(ex.Messa ge)
> Application.Exi t()
> End Try
>
> MsgBox("Filesiz e: " & lFileSize)
>
>
> Thanks again. Your help is greatly appreciated!
>
> /Snedker
>[/color]

**Morten Snedker** · Nov 21 '05, 07:10 AM

Re: WebClient & Proxy (407 Proxy authentication required)

On Thu, 25 Nov 2004 03:43:03 -0800, "Chris Podmore"
<ChrisPodmore@d iscussions.micr osoft.com> wrote:
[color=blue]
>I'm at a bit of a loss as to what your problem is now. We have ISA etc and
>the following code works fine for me.[/color]
[color=blue]
>Sorry I can't be more help.[/color]

Don't be - you've helped plenty !! :-)
[color=blue]
>Dim r As WebResponse = obj_HTTPWebRequ est.GetResponse ()[/color]

I had
Dim r As HttpWebResponse = .GetResponse()
which is why it didn't work.

But with your help in regards to the proxy, and my little typo, I'm on
the right track...and all is working!

Thanks a lot!

Mr. Happy-Dude :-)

WebClient & Proxy (407 Proxy authentication required)

WebClient & Proxy (407 Proxy authentication required)

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