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I have a .NET program running on Ubuntu via Mono 2.10 The program downloads a webpage via an HttpWebRequest every minute or so which works fine most of the time: String result; WebResponse objResponse; WebRequest objRequest = System.Net.HttpWebRequest.Create(url); using (objResponse = objRequest.GetResponse()) { using (StreamReader sr = new StreamReader(objResponse.GetResponseStream())) { result = sr.ReadToEnd(); // Close and clean up the StreamReader sr.Close(); } } The problem is that after few days I start getting exceptions thrown: DateTime: 01/25/2012 08:15:41 Type: System.Net.WebException Error: Error: NameResolutionFailure Stack: at System.Net.HttpWebRequest.EndGetResponse (IAsyncResult asyncResult) [0x00000] in <filename unknown>:0 at System.Net.HttpWebRequest.GetResponse () [0x00000] in <filename unknown>:0 at socks_server.Program.readHtmlPage (System.String url) [0x00000] in <filename unknown>:0 at socks_server.Program.getAccessKeysProc () [0x00000] in <filename unknown>:0 The server is still abel to resolve DNS, for example wget http://www.google.com Will return the file without any probelm as will ping and other commands that resolve DNS. My program however will continue to throw that exception until I restart it. After restarting the application it will start working again as it should. I have checked open file counts on the system (400 ish), memory usage (327mb of 4gb), CPU usage (2-3%) and all are OK. Any ideas?

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