diff --git a/src/com/sheepit/client/Client.java b/src/com/sheepit/client/Client.java
index 00b18be..d956fee 100644
--- a/src/com/sheepit/client/Client.java
+++ b/src/com/sheepit/client/Client.java
@@ -639,26 +639,26 @@ import lombok.Data;
 	}
 	
 	public Error.Type work(final Job ajob) {
-		int ret;
+		Error.Type downloadRet;
 		
 		gui.setRenderingProjectName(ajob.getName());
 		
 		try {
-			ret = this.downloadExecutable(ajob);
-			if (ret != 0) {
+			downloadRet = this.downloadExecutable(ajob);
+			if (downloadRet != Error.Type.OK) {
 				gui.setRenderingProjectName("");
-				this.log.error("Client::work problem with downloadExecutable (ret " + ret + ")");
-				return Error.Type.DOWNLOAD_FILE;
+				this.log.error("Client::work problem with downloadExecutable (ret " + downloadRet + ")");
+				return downloadRet;
 			}
 			
-			ret = this.downloadSceneFile(ajob);
-			if (ret != 0) {
+			downloadRet = this.downloadSceneFile(ajob);
+			if (downloadRet != Error.Type.OK) {
 				gui.setRenderingProjectName("");
-				this.log.error("Client::work problem with downloadSceneFile (ret " + ret + ")");
-				return Error.Type.DOWNLOAD_FILE;
+				this.log.error("Client::work problem with downloadSceneFile (ret " + downloadRet + ")");
+				return downloadRet;
 			}
 			
-			ret = this.prepareWorkingDirectory(ajob); // decompress renderer and scene archives
+			int ret = this.prepareWorkingDirectory(ajob); // decompress renderer and scene archives
 			if (ret != 0) {
 				gui.setRenderingProjectName("");
 				this.log.error("Client::work problem with this.prepareWorkingDirectory (ret " + ret + ")");
@@ -716,36 +716,40 @@ import lombok.Data;
 		return Error.Type.OK;
 	}
 	
-	protected int downloadSceneFile(Job ajob_) throws FermeExceptionNoSpaceLeftOnDevice {
+	protected Error.Type downloadSceneFile(Job ajob_) throws FermeExceptionNoSpaceLeftOnDevice {
 		return this.downloadFile(ajob_, ajob_.getSceneArchivePath(), ajob_.getSceneMD5(),
 				String.format("%s?type=job&job=%s", this.server.getPage("download-archive"), ajob_.getId()), "project");
 	}
 	
-	protected int downloadExecutable(Job ajob) throws FermeExceptionNoSpaceLeftOnDevice {
+	protected Error.Type downloadExecutable(Job ajob) throws FermeExceptionNoSpaceLeftOnDevice {
 		return this.downloadFile(ajob, ajob.getRendererArchivePath(), ajob.getRendererMD5(),
 				String.format("%s?type=binary&job=%s", this.server.getPage("download-archive"), ajob.getId()), "renderer");
 	}
 	
-	private int downloadFile(Job ajob, String local_path, String md5_server, String url, String download_type) throws FermeExceptionNoSpaceLeftOnDevice {
+	private Error.Type downloadFile(Job ajob, String local_path, String md5_server, String url, String download_type) throws FermeExceptionNoSpaceLeftOnDevice {
 		File local_path_file = new File(local_path);
 		String update_ui = "Downloading " + download_type;
 		
 		if (local_path_file.exists() == true) {
 			this.gui.status("Reusing cached " + download_type);
-			return 0;
+			return Type.OK;
 		}
 		
 		this.gui.status(String.format("Downloading %s", download_type), 0, 0);
 		
 		// must download the archive
-		int ret = this.server.HTTPGetFile(url, local_path, this.gui, update_ui);
+		Error.Type ret = this.server.HTTPGetFile(url, local_path, this.gui, update_ui);
+		
+		if (ret != Type.RENDERER_KILLED_BY_SERVER || ret != Type.RENDERER_KILLED_BY_USER_OVER_TIME) {
+			return ret;
+		}
 		
 		// Try to check the download file even if a download error has occurred (MD5 file check will delete the file if partially downloaded)
 		boolean md5_check = this.checkFile(ajob, local_path, md5_server);
 		int attempts = 1;
 		
-		while ((ret != 0 || md5_check == false) && attempts < this.maxDownloadFileAttempts) {
-			if (ret != 0) {
+		while ((ret != Error.Type.OK || md5_check == false) && attempts < this.maxDownloadFileAttempts) {
+			if (ret != Error.Type.OK) {
 				this.gui.error(String.format("Unable to download %s (error %d). Retrying now", download_type, ret));
 				this.log.debug("Client::downloadFile problem with Server.HTTPGetFile (return: " + ret + ") removing local file (path: " + local_path + ")");
 			}
@@ -758,18 +762,19 @@ import lombok.Data;
 			this.log.debug("Client::downloadFile failed, let's try again (" + (attempts + 1) + "/" + this.maxDownloadFileAttempts + ") ...");
 			
 			ret = this.server.HTTPGetFile(url, local_path, this.gui, update_ui);
+			
 			md5_check = this.checkFile(ajob, local_path, md5_server);
 			attempts++;
 			
-			if ((ret != 0 || md5_check == false) && attempts >= this.maxDownloadFileAttempts) {
+			if ((ret != Error.Type.OK || md5_check == false) && attempts >= this.maxDownloadFileAttempts) {
 				this.log.debug("Client::downloadFile failed after " + this.maxDownloadFileAttempts + " attempts, removing local file (path: " + local_path
 						+ "), stopping...");
 				local_path_file.delete();
-				return -9;
+				return Type.DOWNLOAD_FILE;
 			}
 		}
 		
-		return 0;
+		return Type.OK;
 	}
 	
 	private boolean checkFile(Job ajob, String local_path, String md5_server) {
diff --git a/src/com/sheepit/client/Server.java b/src/com/sheepit/client/Server.java
index e1f19ad..4e1c4a2 100644
--- a/src/com/sheepit/client/Server.java
+++ b/src/com/sheepit/client/Server.java
@@ -137,11 +137,13 @@ public class Server extends Thread {
 							if (serverCode == ServerCode.KEEPMEALIVE_STOP_RENDERING) {
 								this.log.debug("Server::stayAlive server asked to kill local render process");
 								// kill the current process, it will generate an error but it's okay
-								if (this.client != null && this.client.getRenderingJob() != null
-										&& this.client.getRenderingJob().getProcessRender().getProcess() != null) {
+								if (this.client != null && this.client.getRenderingJob() != null) {
 									this.client.getRenderingJob().setServerBlockJob(true);
-									this.client.getRenderingJob().setAskForRendererKill(true);
-									OS.getOS().kill(this.client.getRenderingJob().getProcessRender().getProcess());
+									
+									if (this.client.getRenderingJob().getProcessRender().getProcess() != null) {
+										this.client.getRenderingJob().setAskForRendererKill(true);
+										OS.getOS().kill(this.client.getRenderingJob().getProcessRender().getProcess());
+									}
 								}
 							}
 						}
@@ -414,19 +416,21 @@ public class Server extends Thread {
 		}
 	}
 	
-	public int HTTPGetFile(String url_, String destination_, Gui gui_, String status_) throws FermeExceptionNoSpaceLeftOnDevice {
-		// the destination_ parent directory must exist
+	public Error.Type HTTPGetFile(String url_, String destination_, Gui gui_, String status_) throws FermeExceptionNoSpaceLeftOnDevice {
+		InputStream is = null;
+		OutputStream output = null;
+
 		try {
 			Response response = this.HTTPRequest(url_);
 			
 			if (response.code() != HttpURLConnection.HTTP_OK) {
 				this.log.error("Server::HTTPGetFile(" + url_ + ", ...) HTTP code is not " + HttpURLConnection.HTTP_OK + " it's " + response.code());
-				return -1;
+				return Error.Type.DOWNLOAD_FILE;
 			}
 			
 			long start = new Date().getTime();
-			InputStream is = response.body().byteStream();
-			OutputStream output = new FileOutputStream(destination_);
+			is = response.body().byteStream();
+			output = new FileOutputStream(destination_);
 			
 			long size = response.body().contentLength();
 			byte[] buffer = new byte[8 * 1024];
@@ -435,6 +439,13 @@ public class Server extends Thread {
 			long lastUpd = 0;    // last GUI progress update
 			
 			while ((len = is.read(buffer)) != -1) {
+				if (this.client.getRenderingJob().isServerBlockJob()) {
+					return Error.Type.RENDERER_KILLED_BY_SERVER;
+				}
+				else if (this.client.getRenderingJob().isUserBlockJob()) {
+					return Error.Type.RENDERER_KILLED_BY_USER;
+				}
+				
 				output.write(buffer, 0, len);
 				written += len;
 				
@@ -444,17 +455,13 @@ public class Server extends Thread {
 				}
 			}
 			
-			output.flush();
-			output.close();
-			is.close();
-			
 			gui_.status(status_, 100, size);
 			
 			long end = new Date().getTime();
 			this.log.debug(String.format("File downloaded at %.1f kB/s, written %d B", ((float) (size / 1000)) / ((float) (end - start) / 1000), written));
 			this.lastRequestTime = new Date().getTime();
 			
-			return 0;
+			return Error.Type.OK;
 		}
 		catch (Exception e) {
 			if (Utils.noFreeSpaceOnDisk(new File(destination_).getParent())) {
@@ -465,8 +472,19 @@ public class Server extends Thread {
 			e.printStackTrace(new PrintWriter(sw));
 			this.log.error("Server::HTTPGetFile Exception " + e + " stacktrace " + sw.toString());
 		}
+		finally {
+			try {
+				output.flush();
+				output.close();
+				is.close();
+			}
+			catch (IOException e) {
+				this.log.debug(String.format("Server::HTTPGetFile Error trying to close the open streams (%s)", e.getMessage()));
+			}
+		}
+		
 		this.log.debug(String.format("Server::HTTPGetFile(%s) did fail", url_));
-		return -2;
+		return Error.Type.DOWNLOAD_FILE;
 	}
 	
 	public ServerCode HTTPSendFile(String surl, String file1, int checkpoint) {