If it works when connected to your local sandbox, but fails when you try to go to io-dell-svr8:50070, you need to see if your computer can correctly resolve the name io-dell-svr8 and make sure there is no firewall blocking the connection to 50070 on that host.
From a cmd prompt, you should be able to 'nslookup io-dell-svr8' to see if the name resolves. Telnet is not installed by default on windows 10, but if you have putty, you can try to connect to port 50070 and see if it connects. If it times out, you have firewalls between you that you will have to have opened.
I hope this helps!