The FedEx One Rate service is only supported with the FedEx Web Services carrier. FedEx does not support FedEx One Rate via FedEx Server (FSMS).
If you are currently using FedEx Server (FSMS) and this functionality is desired, contact Pitney Bowes client support or your Pitney Bowes Account Representative to enter a request to be migrated to FedEx Web Services.
Subject: SSL - Rate Carrier LoneStar
Initial Details: Indication: Connectship update applied. Now no rates are produced for LoneStar, returning a HTTP 404 error.
UPDATED: August 30, 2017