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In Java IDE, download source of a dependency does not work depending of your Proxy Settings method. I have these environment variables defined for curl/wget NO_PROXY=localhost,127.0.0.1,.myproxy.corp no_proxy=localhost,127.0.0.1,.myproxy.corp Fail case: Use System Proxy Settings - Source download failed with proxy authentication required on a "no proxy" host. Success case: Manual Proxy Settings Set your "No Proxy Hosts" manually - Source download works ok Hypothesis: It seems that "Use System Proxy Settings" does not take account of a no_proxy/NO_PROXY environment variable. == Various infos == Description of Wget no_proxy https://www.gnu.org/software/wget/manual/html_node/Proxies.html Description of Curl NO_PROXY https://curl.haxx.se/docs/manpage.html Product Version: NetBeans IDE 8.2 (Build 201609300101) Java: 1.8.0_92; Java HotSpot(TM) 64-Bit Server VM 25.92-b14 Runtime: Java(TM) SE Runtime Environment 1.8.0_92-b14 System: Linux version 4.4.0-38-generic running on amd64; UTF-8; fr_FR (nb)