A Kong

Hello, I have the latest USPS contribution installed in my cart, and the settings (state,zipcode, lbs, id, etc, all look good but I'm still getting this error. "An error occurred with the USPS shipping calculations." One thread I found suggested the error may have to do with my hosts settings and curl, it also said that I could figure out where the problem may be by checking the request and response between my site and USPS. Where would I find those logs?