Visual Studio 2017 and using FF Developer for debugging. As off some time this weekend I get this error message.
Worked fine last week.
My local webconfig has the redirect to HTTPS rule disabled. So I am going to localhost, at least not with FF Developer or regular FF has the same error.
Works fine on Chrome and Opera.
Additional System Details
- User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36 OPR/55.0.2994.44
Does this apply?
You can no longer use some domains like .dev locally because its owner (Google) has added this domain to the HSTS preload list and a secure connection is automatically enforced. The ".dev" domain landed on the HSTS preload list in Firefox 59.0b7 and this means that Firefox will automatically try a secure connection to these TLDs.
A possible workaround could be to disable the HSTS preload list, but this is not recommended.
- network.stricttransportsecurity.preloadlist = false