Revert "Merge pull request jenkinsci#193 from witokondoria/fix/Differ…

…entErrorCodesHandling"

This reverts commit 21e59c5, reversing
changes made to ab254bb.

src/main/java/hudson/remoting/Launcher.java

@@ -29,7 +29,6 @@
 import java.io.Console;
 import java.io.FileInputStream;
 import java.io.UnsupportedEncodingException;
-import java.io.FileNotFoundException;
 import java.nio.file.Path;
 import java.security.KeyStore;
 import java.security.KeyStoreException;
@@ -495,12 +494,9 @@ public List<String> parseJnlpArguments() throws ParserConfigurationException, SA
 
                 if (con instanceof HttpURLConnection) {
                     HttpURLConnection http = (HttpURLConnection) con;
-                    if(http.getResponseCode()>=500)
-                        // got the error code. report that (such as 401)
-                        throw new IOException("Failed to load "+slaveJnlpURL+": "+http.getResponseCode()+" "+http.getResponseMessage());
                     if(http.getResponseCode()>=400)
                         // got the error code. report that (such as 401)
-                        throw new FileNotFoundException("Failed to load "+slaveJnlpURL+": "+http.getResponseCode()+" "+http.getResponseMessage());
+                        throw new IOException("Failed to load "+slaveJnlpURL+": "+http.getResponseCode()+" "+http.getResponseMessage());
                 }
 
                 Document dom;
@@ -557,11 +553,6 @@ public List<String> parseJnlpArguments() throws ParserConfigurationException, SA
                     throw x;
                 } else
                     throw e;
-            } catch (FileNotFoundException e) {
-                System.err.println("Failing to obtain "+slaveJnlpURL);
-                e.printStackTrace(System.err);
-                System.err.println("Will silently exit without errors");
-                System.exit(0);
             } catch (IOException e) {
                 if (this.noReconnect)
                     throw (IOException)new IOException("Failing to obtain "+slaveJnlpURL).initCause(e);