It's always best to follow the RFCs [1] to avoid issues like this. ".dev" worked but it was never safe to use it. 1: https://tools.ietf.org/html/rfc2606#page-2

It's always best to follow the RFCs [1] to avoid issues like this. ".dev" worked but it was never safe to use it. 1: https://tools.ietf.org/html/rfc2606#page-2 https://tools.ietf.org/html/rfc2606#page-2