Just a quick tech note today, for anyone using Umbraco.
I was attempting to install a package from the Umbraco package repository and kept getting an error: ERR_NAME_NOT_RESOLVED. It looked like a DNS error, but I couldn't find any DNS problems!
I finally found the right answer: it's the world's most poorly formed permissions problem. Give your IIS user read, write and execute permissions on c:\Windows\Temp, and the problem will go away.