I am trying to overlay the KML file over google maps and want to know where I can host the kml file which I will then be able to add to the google maps. I tried using google drive and dropbox but they do not allow the file to be read from these sites.
Can somebody tell me where I can host it?
UPDATE
According to this google-groups discussion, I cannot overlay a KML file from my local system.
Best Answer
As you have already discovered, you cannot host the KML file on your local system. The file is fetched by Google Maps via http, so you must host it on a system that will respond to http requests from Google Maps. You could create an account at Google Sites if you want to stay in the Google ecosystem. If you're developing a web app, just host it on your web server. This is pretty much explained in the link you provided above.
A number of approaches are explained in this question, which is a nearly exact duplicate.