Hello Banchi,
This issue is related to CCproxy itself, and the question is better suited on Stackexchange network using the relevant tags, where community and Google's engineers are active.
You can check this Help Center
article for more information on installing Squid proxy server which is only one way of setting up a proxy server on GCE and is also available for
windows. I was able to find this Stackoverflow
answer that can help you resolve your issue.
I hope this helps.
Sincerely,
George