Latest version of Chrome seems to give extremely limited information on what might be wrong. It only says:
"Oops! Google Chrome could not connect to"
It used to have error codes and so on.
How can I get Chrome to tell me more details?
You can turn off the newer-style friendly error messages like this (from google's help pages):
Then when you visit a host which can't be found in DNS or a host which is not responding to http requests, you will get the option to choose "more" to see a little more information.