Solved

Error: "Unable to connect to the remote server" when using GetResponse or EndGetResponse

Posted on 2004-03-29
9
1,423 Views
Last Modified: 2010-08-05
Hi,

the title says it all really - I'm certain the code's right, after scouring the internet for hours trying to solve this, but I can't get away from the error.
I'm basically trying to save a webpage to file, given a url.
So is it something to do with my internet setup or firewall?
Incidentally, when I try to add a web reference in visual studio, it gives the same error but still brings the webpage up.

Any ideas? Cheers all.
0
Comment
Question by:shifty_mc
  • 5
  • 4
9 Comments
 
LVL 12

Expert Comment

by:dfiala13
ID: 10710500
Post your code. It could be a firewall issue, but if you are accessing the Internet otherwise it is unlikely.
0
 

Author Comment

by:shifty_mc
ID: 10710603
ok...

public Browser()
{
      Uri url = new Uri("http://www.radiotimes.com/tv/now.html");
      HttpWebRequest wr = (HttpWebRequest) WebRequest.Create(url);            
      AsyncCallback a = new AsyncCallback(OnComplete);
      IAsyncResult r = (IAsyncResult) wr.BeginGetResponse(a,wr);
}

static void OnComplete(IAsyncResult ar)
{
      
      HttpWebRequest r = (HttpWebRequest) ar.AsyncState;
      HttpWebResponse re = (HttpWebResponse) r.EndGetResponse(ar);                        
      Stream str = re.GetResponseStream();
      Byte[] inBuf = new Byte[500000];
                int bytesToRead = (int) inBuf.Length;
      int bytesRead = 0;
      while (bytesToRead > 0)
      {
            int n = str.Read(inBuf, bytesRead,bytesToRead);
                      if (n==0)
            break;
            bytesRead += n;
            bytesToRead -= n;
      }
      FileStream fstr = new FileStream("C:\\webpagetest.html", FileMode.Create,FileAccess.Write);
      fstr.Write(inBuf, 0, bytesRead);
      str.Close();
      fstr.Close();            
}

The error occurs in the line
HttpWebResponse re = (HttpWebResponse) r.EndGetResponse(ar);
I've also tried it synchronously, with GetResponse, and get the same error.
Thanks.
0
 
LVL 12

Expert Comment

by:dfiala13
ID: 10710697
I think the problem is that you are never starting the communication.  Here's a snippet I wrote for a scraper.  It's snychronous and it uses a string URL as opposed to creating a Uri object.

Try this and see if it works (works for me), then we will at least know if it is a code problem or not.

HttpWebRequest req = (HttpWebRequest)WebRequest.Create(sURL);
req.KeepAlive = false;
HttpWebResponse res = (HttpWebResponse)req.GetResponse();
StreamReader sr = new StreamReader(res.GetResponseStream(),true);
string s = sr.ReadToEnd();
res.Close();
0
Gigs: Get Your Project Delivered by an Expert

Select from freelancers specializing in everything from database administration to programming, who have proven themselves as experts in their field. Hire the best, collaborate easily, pay securely and get projects done right.

 

Author Comment

by:shifty_mc
ID: 10710761
yeah, still get the error in
HttpWebResponse res = (HttpWebResponse)req.GetResponse();
0
 

Author Comment

by:shifty_mc
ID: 10710823
Ahh, I've got it - I was connecting to the internet through a proxy which was causing the problem.
When I turned that off it worked fine.
But how would I use this code when working with proxies and so on - ideally I'd be able to check the connection on a user's computer and adjust the connection appropriately?
0
 
LVL 12

Expert Comment

by:dfiala13
ID: 10710876
Ah, a proxy!  There is a class for working with that and a little code to tell your app to use a proxy.

http://support.microsoft.com/default.aspx?scid=kb;en-us;307023
0
 
LVL 12

Accepted Solution

by:
dfiala13 earned 250 total points
ID: 10710885
You can add a test function that tries to connect to a well known and ususally up URL (http://www.microsoft.com).  If it fails you can switch over to the proxy code and possibly prompt the user for proxy info.
0
 

Author Comment

by:shifty_mc
ID: 10710931
ok, I'll give it a go,
thanks for your help.
0
 
LVL 12

Expert Comment

by:dfiala13
ID: 10710957
You're welcome.  Glad you got it working.
0

Featured Post

Announcing the Most Valuable Experts of 2016

MVEs are more concerned with the satisfaction of those they help than with the considerable points they can earn. They are the types of people you feel privileged to call colleagues. Join us in honoring this amazing group of Experts.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
What is "public object" in C#? 3 45
Graphics 2 26
Printing 1 50
application restarter  - for an exe that hangs 9 24
Summary: Persistence is the capability of an application to store the state of objects and recover it when necessary. This article compares the two common types of serialization in aspects of data access, readability, and runtime cost. A ready-to…
The article shows the basic steps of integrating an HTML theme template into an ASP.NET MVC project
Sending a Secure fax is easy with eFax Corporate (http://www.enterprise.efax.com). First, just open a new email message. In the To field, type your recipient's fax number @efaxsend.com. You can even send a secure international fax — just include t…
This video shows how to use Hyena, from SystemTools Software, to bulk import 100 user accounts from an external text file. View in 1080p for best video quality.

815 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

11 Experts available now in Live!

Get 1:1 Help Now