我在Github上使用fork来获取支持VirtualBox 5.1.6的virtualbox插件。安装插件并配置节点后，我单击启动按钮将代理设置为联机，在启动过程中，它确实运行了虚拟机，但始终无法将代理设置为联机。日志如下所示。
我有Jenkins ver。 2.89.2和virtualbox 5.1.6
[VirtualBox] Launching node Automatic Test setup
[VirtualBox] Powering up VirtualBoxMachine{host=VirtualBoxHost{url='http://10.1.20.81:18083', username=''},name='Automatic Test setup'}...
[VirtualBox] node Automatic Test setup in state Running
[VirtualBox] node Automatic Test setup started
[VirtualBox] Sleep before stage 2 launcher, attempt 1
[VirtualBox] Starting stage 2 launcher (JNLPLauncher)
[VirtualBox] Stage 2 launcher completed
[VirtualBox] Sleep before stage 2 launcher, attempt 2
[VirtualBox] Starting stage 2 launcher (JNLPLauncher)
[VirtualBox] Stage 2 launcher completed
[VirtualBox] Sleep before stage 2 launcher, attempt 3
[VirtualBox] Starting stage 2 launcher (JNLPLauncher)
[VirtualBox] Stage 2 launcher completed
[VirtualBox] Sleep before stage 2 launcher, attempt 4
[VirtualBox] Starting stage 2 launcher (JNLPLauncher)
[VirtualBox] Stage 2 launcher completed
[VirtualBox] Sleep before stage 2 launcher, attempt 5
[VirtualBox] Starting stage 2 launcher (JNLPLauncher)
[VirtualBox] Stage 2 launcher completed
[VirtualBox] Sleep before stage 2 launcher, attempt 6
[VirtualBox] Starting stage 2 launcher (JNLPLauncher)
[VirtualBox] Stage 2 launcher completed
[VirtualBox] Sleep before stage 2 launcher, attempt 7
[VirtualBox] Starting stage 2 launcher (JNLPLauncher)
[VirtualBox] Stage 2 launcher completed
[VirtualBox] Sleep before stage 2 launcher, attempt 8
[VirtualBox] Starting stage 2 launcher (JNLPLauncher)
[VirtualBox] Stage 2 launcher completed
[VirtualBox] Sleep before stage 2 launcher, attempt 9
[VirtualBox] Starting stage 2 launcher (JNLPLauncher)
[VirtualBox] Stage 2 launcher completed
[VirtualBox] Sleep before stage 2 launcher, attempt 10
[VirtualBox] Starting stage 2 launcher (JNLPLauncher)
[VirtualBox] Stage 2 launcher completed
[VirtualBox] Sleep before stage 2 launcher, attempt 11
[VirtualBox] Starting stage 2 launcher (JNLPLauncher)
[VirtualBox] Stage 2 launcher completed
[VirtualBox] Maximum number of attempts reached