This is the complete code that shows the issue:
GeoNearest["ZIPCode", GeoPosition[{40.11, -88.24}], {All, Quantity[5,"Miles"]}]
Error message: A network operation for Geonearest timed out. Please try again later.
Tried 10/8/2017 9:40 PM PDT
I am using the WOLFRAM PROGRAMMING LAB with a URL that starts with https://lab.wolframcloud.com