The Java system property "Djava.net.preferIPv4Stack=true" could block IPv6. It can be set through the _JAVA_OPTIONS environment variable. Remove it if present and restart Windows.
Apple Signature Key Requirement The connector must contact Apple at http://gs.apple.com to fetch a signature key for mounting iOS developer images on the devices. During the connector installation, we can set a proxy for enabling communication with the FT Lab server; however, such a proxy is not used for communication with the mentioned Apple online service.
If your network requires a proxy for reaching this Apple online service, update the connector.properties file: APPLE_HTTP_PROXY_HOST=<proxy host name> APPLE_HTTP_PROXY_PORT=<proxy port number>
If the proxy needs authentication, below two properties need to be added as well: APPLE_HTTP_PROXY_USERNAME=<proxy username> APPLE_HTTP_PROXY_PASSWORD=<proxy password>
(Located in <installation_dir>/connector or server/conf/)