Problem with HttpWebRequest.

[Dave R]

Hi all,

I am using the HttpWebRequest/HttpWebResponse API in my application to post data
to a remote server.
The remote server is a Unix box (remoteserver.remotedomain.com).
But somehow I receive no response from the server.
If I use a server in my own domain and specify
WebRequest.Create("http://myserver:1200"); things work fine.
Even fully qualified name of my own localserver fetches no response i.e.
WebRequest.Create("http://myserver.mydomain.com:1200"); things do not work.


Here is the relevant code.

HttpWebRequest request = (HttpWebRequest)
WebRequest.Create("http://remoteserver.remotedomain.com:1200");

request.Method = "POST" ;
request.ContentType = "application/vnd.wv.csp.wbxml";
request.ContentLength= Buffer.Length ;

WebProxy myProxy = WebProxy.GetDefaultProxy ();
request.Proxy = myProxy ;

Stream newStream = request.GetRequestStream(); newStream.Write (Buffer, 0,
Buffer.Length);

// Close the Stream object.
newStream.Close();

//****** CULPRIT LINE *********//
// The following call just blocks.
HttpWebResponse response = (HttpWebResponse)request.GetResponse ();

// *********************** //
// Get the stream associated with the response.
Stream receiveStream = response.GetResponseStream ();

/// ... so on

Am I missing on something ?

Best regards,
Dave

 

[Feroze [MSFT]]

IS your app blocking indefinitely, or just taking a long time ? Maybe your
server is outside of your lan, so webrequest might not succeed unless you go
through a proxy ?

If this is not the case, please give more details about your configuration.
can you do a GET request against the server using the fully qualified domain
name (FQDN)

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[Dave R]

Hi Feroze,

Thanks for the reply.
My applications blocks indefinitely till I get an Operation time out error.
Well you are correct in that my remote server is outside my LAN.
I use VPN to connect to it, so virtually the remote server is on my intranet.

I have tried to run my app. with and without setting the proxy.
Wioth both the application blocks :-(
This is the relevent code -
WebProxy myProxy = WebProxy.GetDefaultProxy ();
// request is an HttpWebRequest object.
request.Proxy = myProxy ;

IMO, I should not be setting the proxy because effectively server is in my
domain (am on VPN).
But somehow call just doesn't go through.

One intresting observation is that if I use Remote terminal Service client and
run my app from a remote NT box to connect to the remote server, all calls run
fine.
Am puzzled as to why it runs through remote NT box and not when I try it through
VPN.
I could also resolve "remoteserver.remotedomain.com" to aaa.bbb.ccc.ddd IP
address through Dns class while being on VPN.

Any thoughts?

Best regards,
Dave

P.S : I think it's some network issue but am confused beacuse I can resolve the
IP address of the remote server while being on VPN. Essentially API also might
be doing it.

IS your app blocking indefinitely, or just taking a long time ? Maybe your
server is outside of your lan, so webrequest might not succeed unless you go
through a proxy ?

If this is not the case, please give more details about your configuration.
can you do a GET request against the server using the fully qualified domain
name (FQDN)

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[Feroze [MSFT]]

Hmm. If you are connected on the VPN, you should be able to get this to
work. Do you have access to a network sniffer ? Can you run a network
sniffer on your app to see what is happening ?

I am assuming you already tried hitting your site with a browser ?

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