Wordpress + WP REST API Authentication Issues

I have been trying to get any kind of authentication to work with the wordpress install and the WP REST API. I have tried the basic authentication and Oauth and all requests other than read only type requests return 401 or 403 errors (using Postman). I have read that some folks have had issues with CGI on Dreamhost causing problems, but I dont seem to find the same things to look for in my install. Does anyone have any experience with this that might be able to offer some insight?