Regarding the miner.conf file of the mumus 1.4 CPU miner: I found that you need to type in either the IP: ("host": "37.58.113.236") or ("host": "nxscpumining.com") but WITHOUT "http://" and any "/"

I had the same problem as you and finally solved it by finding a working pool server and typing the host in the correct way. I hope this will also help you and others.