Thanks Anna, the password reset is working again. However, when trying to access the control panel, I get the error "Failed to create login token: key creation failed. If this account was just created, it may take several minutes to become available". I've waited over 24 hours so I assume...
A bunch of my scripts that use cURL are also suddenly getting empty responses. curl_error says 'Couldn't resolve host'. file_get_contents throws a similar error. so it looks to be a problem on x10's end