Comment 13 for bug 1241010

Looking at the log file I see this message:

2013-10-17 17:12:25,353 WARNING mirror check skipped, *overriden* via config

This means that one of the following was set on your system:

        # skip mirror check if special environment is set
        # (useful for server admins with internal repos)
        if (self.config.getWithDefault("Sources","AllowThirdParty",False) or
            "RELEASE_UPRADER_ALLOW_THIRD_PARTY" in os.environ):
            logging.warning("mirror check skipped, *overriden* via config")
            mirror_check=False

Had you set RELEASE_UPRADER_ALLOW_THIRD_PARTY in your environment?