I am using stratum+tcp://stratum.westhash.com:3334 which is the same url I am using on miningrigrentals. I wonder what the issue is. Does technical support usually look in this thread and help?
after you set the pool and submit, go to your main page and try 'restart minergate'
I tried that and I am also getting the same issue on my S4. I wonder if they are blocking me?