Solved

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

Posted on 2004-03-29
9
1,462 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
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 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
Salesforce Has Never Been Easier

Improve and reinforce salesforce training & adoption using WalkMe's digital adoption platform. Start saving on costly employee training by creating fast intuitive Walk-Thrus for Salesforce. Claim your Free Account Now

 

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

Want Experts Exchange at your fingertips?

With Experts Exchange’s latest app release, you can now experience our most recent features, updates, and the same community interface while on-the-go. Download our latest app release at the Android or Apple stores today!

Question has a verified solution.

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

Entity Framework is a powerful tool to help you interact with the DataBase but still doesn't help much when we have a Stored Procedure that returns more than one resultset. The solution takes some of out-of-the-box thinking; read on!
Exception Handling is in the core of any application that is able to dignify its name. In this article, I'll guide you through the process of writing a DRY (Don't Repeat Yourself) Exception Handling mechanism, using Aspect Oriented Programming.
Michael from AdRem Software explains how to view the most utilized and worst performing nodes in your network, by accessing the Top Charts view in NetCrunch network monitor (https://www.adremsoft.com/). Top Charts is a view in which you can set seve…
If you’ve ever visited a web page and noticed a cool font that you really liked the look of, but couldn’t figure out which font it was so that you could use it for your own work, then this video is for you! In this Micro Tutorial, you'll learn yo…

627 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