diff --git a/src/com/sheepit/client/Client.java b/src/com/sheepit/client/Client.java
index 08a164e..f78982b 100644
--- a/src/com/sheepit/client/Client.java
+++ b/src/com/sheepit/client/Client.java
@@ -36,6 +36,7 @@ import com.sheepit.client.exception.FermeException;
 import com.sheepit.client.exception.FermeExceptionNoRightToRender;
 import com.sheepit.client.exception.FermeExceptionNoSession;
 import com.sheepit.client.exception.FermeExceptionSessionDisabled;
+import com.sheepit.client.exception.FermeServerDown;
 import com.sheepit.client.os.OS;
 
 public class Client {
@@ -205,6 +206,18 @@ public class Client {
 						}
 					}
 				}
+				catch (FermeServerDown e) {
+					int wait = 15;
+					int time_sleep = 1000 * 60 * wait;
+					this.gui.status(String.format("Can not connect to server. Please check your connectivity. Will retry in %s minutes", 15));
+					try {
+						Thread.sleep(time_sleep);
+					}
+					catch (InterruptedException e1) {
+						return -3;
+					}
+					continue; // go back to ask job
+				}
 				catch (FermeException e) {
 					this.gui.error("Client::renderingManagement exception requestJob (1) " + e.getMessage());
 					StringWriter sw = new StringWriter();
diff --git a/src/com/sheepit/client/Server.java b/src/com/sheepit/client/Server.java
index 1ad5e04..434d888 100644
--- a/src/com/sheepit/client/Server.java
+++ b/src/com/sheepit/client/Server.java
@@ -78,6 +78,7 @@ import com.sheepit.client.exception.FermeException;
 import com.sheepit.client.exception.FermeExceptionNoRightToRender;
 import com.sheepit.client.exception.FermeExceptionNoSession;
 import com.sheepit.client.exception.FermeExceptionSessionDisabled;
+import com.sheepit.client.exception.FermeServerDown;
 import com.sheepit.client.os.OS;
 
 public class Server extends Thread implements HostnameVerifier, X509TrustManager {
@@ -145,6 +146,9 @@ public class Server extends Thread implements HostnameVerifier, X509TrustManager
 						}
 					}
 				}
+				catch (NoRouteToHostException e) {
+					this.log.debug("Server::keeepmealive can not connect to server");
+				}
 				catch (IOException e) {
 					e.printStackTrace();
 				}
@@ -434,6 +438,9 @@ public class Server extends Thread implements HostnameVerifier, X509TrustManager
 		catch (FermeException e) {
 			throw e;
 		}
+		catch (NoRouteToHostException e) {
+			throw new FermeServerDown();
+		}
 		catch (Exception e) {
 			StringWriter sw = new StringWriter();
 			PrintWriter pw = new PrintWriter(sw);
diff --git a/src/com/sheepit/client/exception/FermeServerDown.java b/src/com/sheepit/client/exception/FermeServerDown.java
new file mode 100644
index 0000000..00f3295
--- /dev/null
+++ b/src/com/sheepit/client/exception/FermeServerDown.java
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2015 Laurent CLOUET
+ * Author Laurent CLOUET <laurent.clouet@nopnop.net>
+ *
+ * This program is free software; you can redistribute it and/or 
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; version 2
+ * of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+package com.sheepit.client.exception;
+
+/**
+ * Server down (server side error) or unreachable (client side error)
+ *
+ */
+public class FermeServerDown extends FermeException {
+	public FermeServerDown() {
+		super();
+	}
+	
+	public FermeServerDown(String message_) {
+		super(message_);
+	}
+}