我有一个使用 Selenium 插件在 Jenkins 上运行的 Selenium Grid 集线器。我在同一台机器上运行了一个 Selenium 网格节点，它已成功连接到集线器。从外部机器我似乎无法通过 Jenkins ping 集线器运行的 4444 端口。如果 Hub 通过命令行单独启动，我可以 ping 端口。我的两台机器上都禁用了防火墙，所以这不是网络问题。
java -jar selenium-server-standalone-2.46.0.jar -role node -hub http://<IP>:4444/grid/register -timeout 10000 -browserTimeout 10000 -sessionMaxIdleTimeInSeconds 10000
16:34:58.122 INFO - Launching a Selenium Grid node
16:34:59.982 WARN - error getting the parameters from the hub. The node may end up with wrong timeouts.Connect to <IP>:4444 [<IP>] failed: Connection refused: connect
16:35:00.029 INFO - Java: Oracle Corporation 25.51-b03
16:35:00.029 INFO - OS: Windows 8.1 6.3 amd64
16:35:00.044 INFO - v2.46.0, with Core v2.46.0. Built from revision 87c69e2
16:35:00.107 INFO - Driver class not found: com.opera.core.systems.OperaDriver
16:35:00.107 INFO - Driver provider com.opera.core.systems.OperaDriver is not registered
16:35:00.154 INFO - Version Jetty/5.1.x
16:35:00.154 INFO - Started HttpContext[/selenium-server,/selenium-server]
16:35:00.154 INFO - Started org.openqa.jetty.jetty.servlet.ServletHandler@76a4d6c
16:35:00.154 INFO - Started HttpContext[/wd,/wd]
16:35:00.154 INFO - Started HttpContext[/selenium-server/driver,/selenium-server/driver]
16:35:00.154 INFO - Started HttpContext[/,/]
16:35:00.154 INFO - Started SocketListener on 0.0.0.0:5555
16:35:00.154 INFO - Started org.openqa.jetty.jetty.Server@1f7030a6
16:35:00.154 INFO - Selenium Grid node is up and ready to register to the hub
16:35:00.185 INFO - Starting auto registration thread. Will try to register every 5000 ms.
16:35:00.200 INFO - Registering the node to the hub: http://<IP>/grid/register
16:35:01.232 INFO - Couldn't register this node: Error sending the registration request: Connect to <IP>:4444 [IP] failed: Connection refused: connect
16:35:07.232 INFO - Couldn't register this node: The hub is down or not responding: Connect to <IP>:4444 [IP] failed: Connection refused: connect
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