I've written a programm that opens a httpurlconnection to a website through random proxies. My httpurlconnection is called "conn". Now I know, that some of those proxies might be too slow, so i've set the timeout of the connection to 40000 milliseconds with conn.setConnectTimeout(40000) and conn.setReadTimeout(40000).

I've written a programm that opens a httpurlconnection to a website through random proxies. My httpurlconnection is called conn. Now I know, that some of those proxies might be too slow, so i've set the timeout of the connection to 40000 milliseconds with conn.setConnectTimeout(40000) and conn.setReadTimeout(40000).

long diff = 0; long starttime = 0; long endtime = 0; try { starttime = System.currentTimeMillis(); conn.connect(); endtime = System.currentTimeMillis(); diff = endtime - starttime; if (endtime <= starttime + conn.getConnectTimeout()) { //Trying to read sourecode InputStreamReader isrConn = new InputStreamReader(conn.getInputStream()); BufferedReader brConn = new BufferedReader(isrConn); line = brConn.readLine(); while (line != null) { response += line + "\t"; try { line = brConn.readLine(); } catch (IOException e) { printError("Reading sourcecode failed."); } } } else { response = "blabla."; } // If conn.connect failed } catch (IOException e) { endtime = System.currentTimeMillis(); diff = endtime - starttime; response = "Message: "+e.getMessage() +" MyTimeout:"+ conn.getConnectTimeout() +" Actual time passed: "+ diff; } 

So my question would be: I have set the timeout to 40000 milliseconds, but i get a "Connection timed out"-response after about 21000 milliseconds, does any of you know why that is?

long diff = 0; long starttime = 0; long endtime = 0; try { starttime = System.currentTimeMillis(); conn.connect(); endtime = System.currentTimeMillis(); diff = endtime - starttime; if (endtime <= starttime + conn.getConnectTimeout()) { //Trying to read sourecode InputStreamReader isrConn = new InputStreamReader(conn.getInputStream()); BufferedReader brConn = new BufferedReader(isrConn); line = brConn.readLine(); while (line != null) { response += line + "\t"; try { line = brConn.readLine(); } catch (IOException e) { printError("Reading sourcecode failed."); } } } else { response = "blabla."; } // If conn.connect failed } catch (IOException e) { endtime = System.currentTimeMillis(); diff = endtime - starttime; response = "Message: "+e.getMessage() +" MyTimeout:"+ conn.getConnectTimeout() +" Actual time passed: "+ diff;   e.printStackTrace();  } 

So my question would be: I have set the timeout to 40000 milliseconds, but i get a "Connection timed out"-response after about 21000 milliseconds, does any of you know why that is?

EDIT: im using windows 7 and i now added the e.printStackTrace() to the catch-block, like told in the comments. thanks so far. the output now is (example):

java.net.ConnectException: Connection timed out: connect at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method) at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source) at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source) at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source) at java.net.AbstractPlainSocketImpl.connect(Unknown Source) at java.net.PlainSocketImpl.connect(Unknown Source) at java.net.Socket.connect(Unknown Source) at sun.net.NetworkClient.doConnect(Unknown Source) at sun.net.www.http.HttpClient.openServer(Unknown Source) at sun.net.www.http.HttpClient$1.run(Unknown Source) at sun.net.www.http.HttpClient$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at sun.net.www.http.HttpClient.privilegedOpenServer(Unknown Source) at sun.net.www.http.HttpClient.openServer(Unknown Source) at sun.net.www.http.HttpClient.<init>(Unknown Source) at sun.net.www.http.HttpClient.New(Unknown Source) at sun.net.www.http.HttpClient.New(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection.plainConnect(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection.connect(Unknown Source) at TestThread.getSourcePage(TestThread.java:361) at TestThread.aChecker(TestThread.java:216) at TestThread.getNextProxy(TestThread.java:169) at TestThread.getNextC(TestThread.java:157) at TestThread.aChecker(TestThread.java:273) at TestThread.getNextProxy(TestThread.java:169) at TestThread.aChecker(TestThread.java:295) at TestThread.getNextProxy(TestThread.java:169) at TestThread.getNextC(TestThread.java:157) at TestThread.run(TestThread.java:103) at java.lang.Thread.run(Unknown Source) Message: Connection timed out: connect MyTimeout:40000 Actual time passed: 21015