I solved this finally , in download or check update in CA case, the dynamix plugin manage use wget to download file, it seems http_proxy=http://username:password@proxyserver:port /usr/local/sbin/emhttp & can't effect it. so ,the method is , create a new file .wgetrc in /root and the content is use_proxy=yes http_proxy=http://10.0.0.2:7890 https_proxy=http://10.0.0.2:7890 wait=10 , it works for me , on unraid 6.11.1.  @zestyboy
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