diff --git a/src/main/java/org/gcube/common/authorization/client/exceptions/ObjectNotFound.java b/src/main/java/org/gcube/common/authorization/client/exceptions/ObjectNotFound.java
new file mode 100644
index 0000000..0d7f988
--- /dev/null
+++ b/src/main/java/org/gcube/common/authorization/client/exceptions/ObjectNotFound.java
@@ -0,0 +1,27 @@
+package org.gcube.common.authorization.client.exceptions;
+
+public class ObjectNotFound extends Exception {
+
+	/**
+	 * 
+	 */
+	private static final long serialVersionUID = 1L;
+
+	public ObjectNotFound() {
+		super();
+	}
+
+	public ObjectNotFound(String message, Throwable cause) {
+		super(message, cause);
+	}
+
+	public ObjectNotFound(String message) {
+		super(message);
+	}
+
+	public ObjectNotFound(Throwable cause) {
+		super(cause);
+	}
+
+	
+}
diff --git a/src/main/java/org/gcube/common/authorization/client/proxy/AuthorizationProxy.java b/src/main/java/org/gcube/common/authorization/client/proxy/AuthorizationProxy.java
index df94269..8e0e21c 100644
--- a/src/main/java/org/gcube/common/authorization/client/proxy/AuthorizationProxy.java
+++ b/src/main/java/org/gcube/common/authorization/client/proxy/AuthorizationProxy.java
@@ -2,6 +2,7 @@ package org.gcube.common.authorization.client.proxy;
 
 import java.util.List;
 
+import org.gcube.common.authorization.client.exceptions.ObjectNotFound;
 import org.gcube.common.authorization.library.AuthorizationEntry;
 import org.gcube.common.authorization.library.BannedService;
 
@@ -9,7 +10,7 @@ public interface AuthorizationProxy {
 
 	String generate(String userName, List<String> roles);
 	
-	AuthorizationEntry get(String token);
+	AuthorizationEntry get(String token) throws ObjectNotFound;
 
 	BannedService deny(String userName, String serviceClass, String serviceName);
 
diff --git a/src/main/java/org/gcube/common/authorization/client/proxy/DefaultAuthorizationProxy.java b/src/main/java/org/gcube/common/authorization/client/proxy/DefaultAuthorizationProxy.java
index 448ceb3..e247d43 100644
--- a/src/main/java/org/gcube/common/authorization/client/proxy/DefaultAuthorizationProxy.java
+++ b/src/main/java/org/gcube/common/authorization/client/proxy/DefaultAuthorizationProxy.java
@@ -14,6 +14,7 @@ import java.util.Map;
 
 import org.gcube.common.authorization.client.Binder;
 import org.gcube.common.authorization.client.Constants;
+import org.gcube.common.authorization.client.exceptions.ObjectNotFound;
 import org.gcube.common.authorization.library.AuthorizationEntry;
 import org.gcube.common.authorization.library.BannedService;
 import org.gcube.common.authorization.library.BannedServices;
@@ -63,7 +64,7 @@ public class DefaultAuthorizationProxy implements AuthorizationProxy {
 	}
 
 	@Override
-	public AuthorizationEntry get(final String token) {
+	public AuthorizationEntry get(final String token) throws ObjectNotFound{
 		Call<String, AuthorizationEntry> call = new Call<String, AuthorizationEntry>() {
 
 			@Override
@@ -71,6 +72,7 @@ public class DefaultAuthorizationProxy implements AuthorizationProxy {
 				
 				URL url = new URL(endpoint+"/retrieve/"+token);
 				HttpURLConnection connection = makeRequest(url, "GET");
+				if (connection.getResponseCode()==404) throw new ObjectNotFound("token "+token+" not found");
 				if (connection.getResponseCode()!=200) throw new Exception("error contacting authorization service");
 				if (connection.getContentLengthLong()<=0) return null;
 
@@ -86,6 +88,8 @@ public class DefaultAuthorizationProxy implements AuthorizationProxy {
 			return cache.get(token).getEntry();
 		try {
 			return delegate.make(call);
+		} catch (ObjectNotFound e) {
+			throw e;
 		} catch (Exception e) {
 			throw again(e).asServiceException();
 		}
diff --git a/src/test/java/org/gcube/common/authorizationservice/cl/CallTest.java b/src/test/java/org/gcube/common/authorizationservice/cl/CallTest.java
index 97a3a16..8b1feda 100644
--- a/src/test/java/org/gcube/common/authorizationservice/cl/CallTest.java
+++ b/src/test/java/org/gcube/common/authorizationservice/cl/CallTest.java
@@ -5,6 +5,7 @@ import static org.gcube.common.authorization.client.Constants.authorizationServi
 import java.util.Arrays;
 import java.util.List;
 
+import org.gcube.common.authorization.client.exceptions.ObjectNotFound;
 import org.gcube.common.authorization.library.BannedService;
 import org.gcube.common.scope.api.ScopeProvider;
 import org.junit.Test;
@@ -14,7 +15,11 @@ public class CallTest {
 	@Test
 	public void call(){
 		ScopeProvider.instance.set("/gcube/devsec");
-		System.out.println(authorizationService().build().get("df75336d-0944-4324-b444-c711d21f705b"));
+		try{
+			System.out.println(authorizationService().build().get("fdsafsafsda"));
+		}catch(ObjectNotFound onf){
+			onf.printStackTrace();
+		}
 	}
 	
 	@Test