This means that the public DNS we set up is currently not working for this lab for some reason which I'll need to troubleshoot. there are two options we can use to get you going and I'll let you choose which.
We can reset your labs from scratch which should refresh this DNS entry
You can use the internal IP for the instance which only your endpoint can connect to. On the server, just run 'ifconfig' and find the private IP address, then use that in place of the DNS where asked to.
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