WebResponse.GetResponse Error

[Jonathan]

Calling the System.Net.WebR esponse.GetResp onse method (see
code below) results in the following error:

System.Net.WebE xception: The underlying connection was
closed: An unexpected error occurred on a receive.
at(System.Net.H ttpWebRequest.C heckFinalStatus ())
at System.Net.Http WebRequest.EndG etResponse(IAsy ncResult
asyncResult)
at(System.Net.H ttpWebRequest.G etResponse())

The URL works ok in IE on the same PC.

Does anyone know what would cause this problem, what other
checks I could try or any other method to do the same
thing as System.Net.WebR esponse.GetResp onse?

Thank you in advance.

Private Function HasWebConnectio n() As Boolean
Dim bResult As Boolean
Try
bResult = True
Dim URI As New System.Uri("htt p://www.microsoft.c om")
Dim TestRequest As Net.WebRequest =
Net.WebRequest. Create(URI)
TestRequest.Tim eout = Threading.Timeo ut.Infinite
Dim TestResponse As Net.WebResponse =
TestRequest.Get Response
Catch ex As Exception
Console.WriteLi ne(ex.ToString)
bResult = False
End Try
Return bResult
End Function

[Tian Min Huang]

RE: WebResponse.Get Response Error

Hi,

Thanks for your post. I tested your code, and it works properly on my side.
Now I'd like to share the following information with you:

1. Since IE works properly, I'd like you to check connection setting in IE
options, especially, the proxy setting. You can use WebProxy to set HTTP
proxy for the WebRequest class.

WebProxy Class
http://msdn.microsoft.com/library/de...us/cpref/html/
frlrfsystemnetw ebproxyclasstop ic.asp

2. I recommend you use the sample in KB article 303436 and check whether or
not it works on your side.
SAMPLE: Visual C# .NET Networking Classes HTTP Internet Client

http://support.microsoft.com/?id=303436

I look forward to your result.

Have a nice day!

Regards,

HuangTM
Microsoft Online Partner Support
MCSE/MCSD

Get Secure! -- www.microsoft.com/security
This posting is provided "as is" with no warranties and confers no rights.

[Guest]

RE: WebResponse.Get Response Error

Hi,

Thank you for your informative reply.

When I checked the proxy settings in IE I found that under
the dial-up connection settings the proxy was disabled but
under LAN Settings that the proxy was incorrectly enabled.
Since I am using a dial-up connection I did not think that
this would make any difference (It even states "These
settings will not apply to any dial-up or VPN
connections.") but as a test, I disabled them anyway and
much to my surprise the code worked. I also tried
disconnecting the network cable but it made no difference.
The code always attempted to use the proxy settings under
LAN Settings regardless of the fact that the connection to
the Internet was via a dial-up connection.

This raises another question. Many of my application users
will have laptops that they will connect to a LAN when
they are in the office and to the Internet via dial-up
connections at home. I was hoping just to use the settings
in IE and not have the user set up special settings in my
application. Is there a way of checking which are the
appropriate proxy settings to use.

Thank you,

Jonathan
[color=blue]
>-----Original Message-----
>Hi,
>
>Thanks for your post. I tested your code, and it works[/color]
properly on my side.[color=blue]
>Now I'd like to share the following information with you:
>
>1. Since IE works properly, I'd like you to check[/color]
connection setting in IE[color=blue]
>options, especially, the proxy setting. You can use[/color]
WebProxy to set HTTP[color=blue]
>proxy for the WebRequest class.
>
>WebProxy Class
>http://msdn.microsoft.com/library/default.asp?[/color]
url=/library/en-us/cpref/html/[color=blue]
>frlrfsystemnet webproxyclassto pic.asp
>
>2. I recommend you use the sample in KB article 303436[/color]
and check whether or[color=blue]
>not it works on your side.
>SAMPLE: Visual C# .NET Networking Classes HTTP Internet[/color]
Client[color=blue]
>http://support.microsoft.com/?id=303436
>
>I look forward to your result.
>
>Have a nice day!
>
>Regards,
>
>HuangTM
>Microsoft Online Partner Support
>MCSE/MCSD
>
>Get Secure! -- www.microsoft.com/security
>This posting is provided "as is" with no warranties and[/color]
confers no rights.[color=blue]
>
>.
>[/color]

[Jonathan]

RE: WebResponse.Get Response Error

Hi,

Sorry for the double post. I forgot provide my alias.

Thank you for your informative reply.

When I checked the proxy settings in IE I found that under
the dial-up connection settings the proxy was disabled but
under LAN Settings that the proxy was incorrectly enabled.
Since I am using a dial-up connection I did not think that
this would make any difference (It even states "These
settings will not apply to any dial-up or VPN
connections.") but as a test I disabled them anyway and
much to my surprise the code worked. I also tried
disconnecting the network cable but it made no difference.
The code always attempted to use the proxy settings under
LAN Settings regardless of the fact that the connection to
the Internet was via a dial-up connection.

This raises another question. Many of my application users
will have laptops that they will connect to a LAN when
they are in the office and to the Internet via dial-up
connections at home. I was hoping just to use the settings
in IE and not have the user set up special settings in my
application. Is there a way of checking which are the
appropriate proxy settings to use.

Thank you,

Jonathan
[color=blue]
>-----Original Message-----
>Hi,
>
>Thanks for your post. I tested your code, and it works[/color]
properly on my side.[color=blue]
>Now I'd like to share the following information with you:
>
>1. Since IE works properly, I'd like you to check[/color]
connection setting in IE[color=blue]
>options, especially, the proxy setting. You can use[/color]
WebProxy to set HTTP[color=blue]
>proxy for the WebRequest class.
>
>WebProxy Class
>http://msdn.microsoft.com/library/default.asp?[/color]
url=/library/en-us/cpref/html/[color=blue]
>frlrfsystemnet webproxyclassto pic.asp
>
>2. I recommend you use the sample in KB article 303436[/color]
and check whether or[color=blue]
>not it works on your side.
>SAMPLE: Visual C# .NET Networking Classes HTTP Internet[/color]
Client[color=blue]
>http://support.microsoft.com/?id=303436
>
>I look forward to your result.
>
>Have a nice day!
>
>Regards,
>
>HuangTM
>Microsoft Online Partner Support
>MCSE/MCSD
>
>Get Secure! -- www.microsoft.com/security
>This posting is provided "as is" with no warranties and[/color]
confers no rights.[color=blue]
>
>.
>[/color]

[Tian Min Huang]

RE: WebResponse.Get Response Error

Hi Jonathan,

Thanks for your update. Generally speaking, the WebRequest will get the
proxy information from the settings in IE. If it is using DUN, you can add
the following code to clear the proxy:

Dim myProxy = New Net.WebProxy
TestRequest.Pro xy = myProxy

Hope this helps.

Regards,

HuangTM
Microsoft Online Partner Support
MCSE/MCSD

Get Secure! -- www.microsoft.com/security
This posting is provided "as is" with no warranties and confers no rights.

[Jonathan]

RE: WebResponse.Get Response Error

Hi,

Isn't this a bug in WebRequest? It is not getting using
the proxy settings of the active connection from IE. It
uses the settings under LAN even when there is no LAN
connection.

I see that the code that you sent would clear the proxy
but how would I detect that the user is has a DUN
connection and then how do I know if they don't have proxy
settings on the DUN.

Thanks,

Jonathan
[color=blue]
>-----Original Message-----
>Hi Jonathan,
>
>Thanks for your update. Generally speaking, the[/color]
WebRequest will get the[color=blue]
>proxy information from the settings in IE. If it is using[/color]
DUN, you can add[color=blue]
>the following code to clear the proxy:
>
> Dim myProxy = New Net.WebProxy
> TestRequest.Pro xy = myProxy
>
>Hope this helps.
>
>Regards,
>
>HuangTM
>Microsoft Online Partner Support
>MCSE/MCSD
>
>Get Secure! -- www.microsoft.com/security
>This posting is provided "as is" with no warranties and[/color]
confers no rights.[color=blue]
>
>.
>[/color]

[Tian Min Huang]

RE: WebResponse.Get Response Error

Hi Jonathan,

Thanks for your feedback.
[color=blue][color=green]
>> Isn't this a bug in WebRequest?[/color][/color]
Based on my experience, WebRequest only gets the proxy information from IE
settings and does not check what the active connection is.
[color=blue][color=green]
>> I see that the code that you sent would clear the proxy but how would I[/color][/color]
detect that the user is has a DUN connection and then how do I know if they
don't have proxy settings on the DUN.

Though you can call GetAdaptersInfo () from you .NET managed application via
P/Invoke to check whether the computer connects via LAN or DUN, I strongly
recommend you catch the exception and try using WebRequest without proxy to
work around this problem.

I look forward to your feedback.

Have a nice day!

Regards,

HuangTM
Microsoft Online Partner Support
MCSE/MCSD

Get Secure! -- www.microsoft.com/security
This posting is provided "as is" with no warranties and confers no rights.