ERR_ICANN_NAME_COLLISION when trying to use localhost .dev in Chrome

The pseudo domain name(s) you are using are being registered as a new top level domain.

The DNS returns 127.0.53.53 which is a signal that this TLD is being registered by someone. Chrome versions from M43 have a this new way of relaying the error message to the user.

Use a domain name you own. Possibly using the full name like "localhost.dev.$yourdomain" could help you here depending on your setup.

It appears that Google wants to use .dev only for internal puposes. Under that assumption it seems to be safe to host a "fake" dev zone on your internal DNS server

ICANN has released new public gTLD-s, such as .dev. You can either add the local address to your C:\\Windows\System32\Drivers\etc\hosts file or change the site's address in your web server config file.