First step: find the ip of your host with this tool: 

    https://www.nslookup.io/website-to-ip-lookup/

    The host should look like this: redis-YOURPORTHERE.c311.eu-central-1-1.ec2.cloud.redislabs.com

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Second step: find your "hosts" file - C:\Windows\System32\drivers\etc\hosts

    (If you can't edit this file, try as hard as you can to get ownership of it)

    Add this line to the file:

    (the ip of the host) redis-YOURPORTHERE.c311.eu-central-1-1.ec2.cloud.redislabs.com

    Save the file and try connecting to the database again.