TeamCity web interface not accessible on Chrome

I've installed teamcity on two machines now. The first, I tried reinstalling multiple times because the web interface would launch in Chrome and fail with:

>This site can’t be reached The webpage at http://localhost:6666/ might be temporarily down or it may have moved permanently to a new web address.

>ERR_UNSAFE_PORT

The teamcity-server service was running, but not accessible on the port I'd set up. Eventually I tried `curl localhost:6666`, and got a response, so tried again in Edge browser. In Edge, everything works fine.

On the second machine, same deal. Installed fine, not found in Chrome, works fine in Edge.

Is this a known issue with TeamCity? Is there some kind of setting in Chrome that may need changing? How should I go about diagnosing and fixing the problem?