Type sudo killall -HUP mDNSResponder or the equivalent command for your distribution. 3. Implement a VPN or Proxy Network
The error message typically appears on file-sharing or hosting sites when specific download nodes (servers) are blocked or limited . This is usually not a problem with your computer but rather a server-side or network-level restriction. What are DL3 and DL4 Servers? Type sudo killall -HUP mDNSResponder or the equivalent