multi-process error

[chenchunsy]

we run the command pydcop solve -a dsa -p stop_cycle:20 -m process mygraph5.yaml for the graph coloring problem, the project appears the error as following:
Traceback (most recent call last):
File "/Users/chenchun/anaconda3/envs/pydcopenv/lib/python3.6/site-packages/urllib3/connection.py", line 160, in _new_conn
(self._dns_host, self.port), self.timeout, **extra_kw
File "/Users/chenchun/anaconda3/envs/pydcopenv/lib/python3.6/site-packages/urllib3/util/connection.py", line 84, in create_connection
raise err
File "/Users/chenchun/anaconda3/envs/pydcopenv/lib/python3.6/site-packages/urllib3/util/connection.py", line 74, in create_connection
sock.connect(sa)
socket.timeout: timed out
The input file is a random graph with 34 nodes
we also test the process mode for fewer variables and find the process mode can work for 18 variables. when we add the variables to 19, the project cannot present the running result and display that "Request agent to run".