In Jenkins, open "System Management" → "management node" → "New node" page, "start" option is no "Java Web Start by proxy", how do?
Open the "System Management" to enter the "Global Security Configuration" page.
1. "TCP port JNLP agency agreement" configured to "randomly selected", opening the "agency agreement ...", check "Java Web Start Agent Protocol / 4 (TLS encryption)."
2. Find the "hidden security warning", the "Enable Agent → Master Access Control" check box ticked.
3. Save the configuration and re-open the "New node" page, you can see "Starting the agent through the Java Web" option appears.