I am encountering this error in FME when trying to do a POST request using the HTTPCaller when trying to reindex ArcGIS Portal using FME Desktop 2016.1.
The ArcGIS Portal token was retrieved successfully before Portal reindex that means the proxy settings works fine.
HTTPCaller(HTTPFactory): HTTP/FTP transfer error: 'Failure when receiving data from the peer'
HTTPCaller(HTTPFactory): Please ensure that your network connection is properly set up
HTTPCaller(HTTPFactory): No proxy settings have been entered. If you require a proxy to access external URLs, please ensure the appropriate information has been entered