Question

i am having a internet / security issue with some code i have written.

Basically i am trying to initiate a HttpWebRequest from c# code to a particular URL. nothing fancy, just a basic request.

When i execute on my local machine it works fine.

When i deploy the code to a Windows server 2003 environment the GetResponse method exceptions as follows…

System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond xxx.xxx.xxx.xxx:80
   at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress)
   at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Int32 timeout, Exception& exception)
   --- End of inner exception stack trace ---
   at System.Net.HttpWebRequest.GetResponse()
   at xxxxxx.xxxxxxxxxx.xxxxxxxx.xxxxxxxxxx()

Interestingly, if i put the same URL into an internet explorer browser, the page loads fine so i dont think its a connectivity issue.

I have thought maybe firewall? -> but its turned off.

I also investigation .NET runtime security and temporarily set the All_Code group to have FullTrust.

Lastly, i added the URL to the trusted sites group.

No idea!!

Can anyone help?

HttpWebRequest httpRequest = (HttpWebRequest)WebRequest.Create(postURL);
httpRequest.Method = "POST";
httpRequest.ContentType = "application/x-www-form-urlencoded";
httpRequest.GetResponse();

Here is the trace log…

System.Net Verbose: 0 : [5004]
WebRequest::Create(http://xxxxxxxxxxxxxx)
System.Net Verbose: 0 : [5004]
HttpWebRequest#63835064::HttpWebRequest(http://xxxxxxxxxx#-1903155940)
System.Net Verbose: 0 : [5004] Exiting
HttpWebRequest#63835064::HttpWebRequest()
System.Net Verbose: 0 : [5004] Exiting
WebRequest::Create() ->
HttpWebRequest#63835064 System.Net
Verbose: 0 : [5004]
HttpWebRequest#63835064::GetResponse()
System.Net Information: 0 : [5004]
Associating HttpWebRequest#63835064
with ServicePoint#11454272 System.Net
Information: 0 : [5004] Associating
Connection#60504909 with
HttpWebRequest#63835064
System.Net.Sockets Verbose: 0 : [5004]
Socket#21950498::Socket(InterNetwork#2)
System.Net.Sockets Verbose: 0 : [5004]
Exiting Socket#21950498::Socket()
System.Net.Sockets Verbose: 0 : [5004]
Socket#21950498::Connect(53:80#904160388)
System.Net.Sockets Verbose: 0 : [5004]
Exiting Socket#21950498::Connect()
System.Net Information: 0 : [5004]
Associating HttpWebRequest#63835064
with ConnectStream#37614147 System.Net
Information: 0 : [5004]
HttpWebRequest#63835064 – Request:
POST /xxxxxxxxxxx HTTP/1.1

System.Net.Sockets Verbose: 0 : [5004]
Socket#21950498::Send()
System.Net.Sockets Verbose: 0 : [5004]
Data from Socket#21950498::Send

// SOCKET DATA

System.Net.Sockets Verbose: 0 : [5004]
Exiting Socket#21950498::Send() ->
297#297 System.Net Information: 0 :
[5004] ConnectStream#37614147 –
Sending headers { Content-Type:
application/x-www-form-urlencoded
Host: paint.pure360.com Connection:
Keep-Alive }. System.Net.Sockets
Verbose: 0 : [5004]
Socket#21950498::Receive()
System.Net.Sockets Verbose: 0 : [5004]
Data from Socket#21950498::Receive

// SOCKET DATA

System.Net.Sockets Verbose: 0 : [5004]
Exiting Socket#21950498::Receive() ->
176#176 System.Net Information: 0 :
[5004] Connection#60504909 – Received
status line: Version=1.1,
StatusCode=302,
StatusDescription=Found. System.Net
Information: 0 : [5004]
Connection#60504909 – Received headers
{ Connection: close Content-Length: 0
Content-Type: text/html Date: Wed, 23
Mar 2011 00:59:11 GMT Location:
http://xxxxxxxxx Server: Apache }.
System.Net Information: 0 : [5004]
ConnectStream#35460724::ConnectStream(Buffered
0 bytes.) System.Net.Sockets Verbose:
0 : [5004] Socket#21950498::Dispose()
System.Net Information: 0 : [5004]
Associating HttpWebRequest#63835064
with ConnectStream#35460724 System.Net
Information: 0 : [5004] Associating
HttpWebRequest#63835064 with
HttpWebResponse#65961401 System.Net
Warning: 0 : [5004]
HttpWebRequest#63835064::() – Error
code 302 was received from server
response. System.Net Warning: 0 :
[5004] HttpWebRequest#63835064::() –
Resubmitting request. System.Net
Information: 0 : [5004] Associating
HttpWebRequest#63835064 with
ServicePoint#47602007 System.Net
Information: 0 : [5004] Associating
Connection#3927761 with
HttpWebRequest#63835064
System.Net.Sockets Verbose: 0 : [5004]
Socket#66771947::Socket(InterNetwork#2)
System.Net.Sockets Verbose: 0 : [5004]
Exiting Socket#66771947::Socket()
System.Net.Sockets Verbose: 0 : [5004]
Socket#66771947::Connect(22:80#383746063)
System.Net.Sockets Error: 0 : [5004]
Exception in the
Socket#66771947::Connect – A
connection attempt failed because the
connected party did not properly
respond after a period of time, or
established connection failed because
connected host has failed to respond
95.128.223.22:80 System.Net.Sockets Verbose: 0 : [5004]
Socket#66771947::Dispose() System.Net
Error: 0 : [5004] Exception in the
HttpWebRequest#63835064:: – Unable to
connect to the remote server
System.Net Error: 0 : [5004] at
System.Net.ServicePoint.GetConnection(PooledStream
PooledStream, Object owner, Boolean
async, IPAddress& address, Socket&
abortSocket, Socket& abortSocket6,
Int32 timeout) at
System.Net.PooledStream.Activate(Object
owningObject, Boolean async, Int32
timeout, GeneralAsyncDelegate
asyncCallback) at
System.Net.Connection.CompleteStartConnection(Boolean
async, HttpWebRequest httpWebRequest)
System.Net Error: 0 : [5004] Exception
in the
HttpWebRequest#63835064::EndGetResponse
– Unable to connect to the remote server System.Net Error: 0 : [5004]
at
System.Net.ServicePoint.GetConnection(PooledStream
PooledStream, Object owner, Boolean
async, IPAddress& address, Socket&
abortSocket, Socket& abortSocket6,
Int32 timeout) at
System.Net.PooledStream.Activate(Object
owningObject, Boolean async, Int32
timeout, GeneralAsyncDelegate
asyncCallback) at
System.Net.Connection.CompleteStartConnection(Boolean
async, HttpWebRequest httpWebRequest)

Answer 1

Your Win2003 configuration probably has a default proxy that is causing this problem. Go into InternetOptions of your IE installation and see if there is a proxy being used. Also, giveing a snippet of the code will help understand the issue more.