diff --git a/src/opengnsys/httpserver.py b/src/opengnsys/httpserver.py
index 47c36ec..a9350e2 100644
--- a/src/opengnsys/httpserver.py
+++ b/src/opengnsys/httpserver.py
@@ -92,7 +92,26 @@ class HTTPServerHandler(BaseHTTPRequestHandler):
             self.sendJsonResponse(data)
         except Exception as e:
             logger.exception()
-            self.sendJsonError(500, exceptionToMessage(e))
+            n_args = len (e.args)
+            if 0 == n_args:
+                logger.error ('Empty exception raised from message processor for "{}"'.format(path[0]))
+                self.sendJsonError(500, exceptionToMessage(e))
+            else:
+                arg0 = e.args[0]
+                if type (arg0) is str:
+                    logger.error ('Message processor for "{}" returned exception string "{}"'.format(path[0], str(e)))
+                    self.sendJsonError (500, exceptionToMessage(e))
+                elif type (arg0) is dict:
+                    if '_httpcode' in arg0:
+                        logger.warning ('Message processor for "{}" returned HTTP code "{}" with exception string "{}"'.format(path[0], str(arg0['_httpcode']), str(arg0['_msg'])))
+                        self.sendJsonError (arg0['_httpcode'], arg0['_msg'])
+                    else:
+                        logger.error ('Message processor for "{}" returned exception dict "{}" with no HTTP code'.format(path[0], str(e)))
+                        self.sendJsonError (500, exceptionToMessage(e))
+                else:
+                    logger.error ('Message processor for "{}" returned non-string and non-dict exception "{}"'.format(path[0], str(e)))
+                    self.sendJsonError (500, exceptionToMessage(e))
+            ## not reached
             
     def do_GET(self):
         module, path, params = self.parseUrl()
diff --git a/src/opengnsys/modules/server/ogAdmClient/__init__.py b/src/opengnsys/modules/server/ogAdmClient/__init__.py
index 7109c92..64e0798 100644
--- a/src/opengnsys/modules/server/ogAdmClient/__init__.py
+++ b/src/opengnsys/modules/server/ogAdmClient/__init__.py
@@ -701,7 +701,9 @@ class ogAdmClientWorker (ServerWorker):
         return self.respuestaEjecucionComando (cmd, herror, ids)
 
     def process_CrearImagenBasica (self, path, get_params, post_params, server):
-        logger.warning ('in process_CrearImagenBasica')
+        logger.debug ('in process_CrearImagenBasica, path "{}" get_params "{}" post_params "{}" server "{}"'.format (path, get_params, post_params, server))
+        logger.warning ('this method has been removed')
+        raise Exception ({ '_httpcode': 404, '_msg': 'This method has been removed' })
 
     def process_CrearSoftIncremental (self, path, get_params, post_params, server):
         logger.warning ('in process_CrearSoftIncremental')
diff --git a/src/opengnsys/workers/server_worker.py b/src/opengnsys/workers/server_worker.py
index b002655..959dcc9 100644
--- a/src/opengnsys/workers/server_worker.py
+++ b/src/opengnsys/workers/server_worker.py
@@ -96,8 +96,8 @@ class ServerWorker(object):
             return self.process(getParams, postParams, server)
         try:
             operation = getattr(self, 'process_' + path[0])
-        except Exception:
-            raise Exception('Message processor for "{}" not found'.format(path[0]))
+        except:
+            raise Exception ({ '_httpcode': 404, '_msg': '{path[0]}: method not found' })
         
         return operation(path[1:], getParams, postParams, server)