Tolerate a target that won't TCP SLP

confluent_server/confluent/discovery/handlers/generic.py

@@ -64,4 +64,5 @@ class NodeHandler(object):
         except IOError as ie:
             if ie.errno == errno.ECONNREFUSED:
                 return None
+            raise
         return self._fp

confluent_server/confluent/discovery/protocols/slp.py

@@ -307,7 +307,10 @@ def _add_attributes(parsed):
         net = socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
     else:
         net = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
-    net.connect(target)
+    try:
+        net.connect(target)
+    except socket.error:
+        return
     net.sendall(attrq)
     rsp = net.recv(8192)
     net.close()