问Jenkins slave 经常掉线，请问有解决办法吗？

jenkins slave 经常无故掉线,求助！已经困扰很久了！请问有什么解决办法吗？

五月 06, 2019 11:42:33 上午 org.jenkinsci.remoting.util.AnonymousClassWarnings warn

警告: Attempt to (de-)serialize anonymous class org.jenkinsci.plugins.gitclient.Git$1; see: https://jenkins.io/redirect/serialization-of-anonymous-classes/

五月 06, 2019 11:42:47 上午 org.jenkinsci.remoting.util.AnonymousClassWarnings warn

警告: Attempt to (de-)serialize anonymous class org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler$1; see: https://jenkins.io/redirect/serialization-of-anonymous-classes/

五月 06, 2019 11:49:56 上午 org.jvnet.winp.Native loadByUrl

警告: Failed to load DLL from static location

java.lang.UnsatisfiedLinkError: Native Libr\remoting\jarCache\12\winp.x64.BD89A6734D0147A7868D1B98DB8EF12D.dll already loaded in another classloade

at java.lang.ClassLoader.loadLibrary0(Unknown Source)

at java.lang.ClassLoader.loadLibrary(Unknown Source)

at java.lang.Runtime.load0(Unknown Source)

at java.lang.System.load(Unknown Source)

at org.jvnet.winp.Native.loadDll(Native.java:243)

at org.jvnet.winp.Native.loadByUrl(Native.java:163)

at org.jvnet.winp.Native.load(Native.java:125)

at org.jvnet.winp.Native.<clinit>(Native.java:94)

at org.jvnet.winp.WinProcess.enableDebugPrivilege(WinProcess.java:245)

at hudson.util.ProcessTree$Windows.<clinit>(ProcessTree.java:674)

at hudson.util.ProcessTree.get(ProcessTree.java:427)

at hudson.Launcher$RemoteLauncher$KillTask.call(Launcher.java:1097)

at hudson.Launcher$RemoteLauncher$KillTask.call(Launcher.java:1088)

at hudson.remoting.UserRequest.perform(UserRequest.java:212)

at hudson.remoting.UserRequest.perform(UserRequest.java:54)

at hudson.remoting.Request$2.run(Request.java:369)

at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)

at java.util.concurrent.FutureTask.run(Unknown Source)

at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

at hudson.remoting.Engine$1.lambda$newThread$0(Engine.java:93)

at java.lang.Thread.run(Unknown Source)

......

五月 07, 2019 3:49:20 上午 org.jenkinsci.remoting.engine.JnlpAgentEndpointResolver waitForReady

信息: Failed to connect to the master. Will try again: java.net.SocketTimeoutException connect timed out

五月 07, 2019 3:49:30 上午 hudson.remoting.jnlp.Main$CuiListener status

信息: Performing onReconnect operation.

五月 07, 2019 3:49:30 上午 hudson.remoting.jnlp.Main$CuiListener status

信息: onReconnect operation completed.

五月 07, 2019 3:49:30 上午 hudson.remoting.jnlp.Main$CuiListener status

信息: Locating server among [http://XX:xxx:XXX:XXX:8080/jenkins/]

五月 07, 2019 3:49:31 上午 org.jenkinsci.remoting.engine.JnlpAgentEndpointResolver resolve

信息: Remoting server accepts the following protocols: [JNLP4-connect, Ping]

五月 07, 2019 3:49:31 上午 org.jenkinsci.remoting.engine.JnlpAgentEndpointResolver resolve

信息: Remoting TCP connection tunneling is enabled. Skipping the TCP Agent Listener Port availability check

五月 07, 2019 3:49:31 上午 hudson.remoting.jnlp.Main$CuiListener status

信息: Agent discovery successful

Agent address: XX:xxx:XXX:XXX

Agent port: 9909

Identity: 78:eb:be:95:53:6c:b4:2b:5c:0e:c4:07:01:a0:72:65

五月 07, 2019 3:49:31 上午 hudson.remoting.jnlp.Main$CuiListener status

信息: Handshaking

五月 07, 2019 3:49:31 上午 hudson.remoting.jnlp.Main$CuiListener status

信息: Connecting to XX:xxx:XXX:XXX:9909

五月 07, 2019 3:49:31 上午 hudson.remoting.jnlp.Main$CuiListener status

信息: Trying protocol: JNLP4-connect

五月 07, 2019 3:49:42 上午 hudson.remoting.jnlp.Main$CuiListener status

信息: Remote identity confirmed: 78:eb:be:95:53:6c:b4:2b:5c:0e:c4:07:01:a0:72:65

五月 07, 2019 3:49:43 上午 org.jenkinsci.remoting.protocol.impl.ConnectionHeadersFilterLayer onRecv

信息: [JNLP4-connect connection to XX:xxx:XXX:XXX/XX:xxx:XXX:XXX:9909] Local headers refused by remote: XX:xxx:XXX:XXX

is already connected to this master. Rejecting this connection.

五月 07, 2019 3:49:47 上午 hudson.remoting.jnlp.Main$CuiListener status

信息: Protocol JNLP4-connect encountered an unexpected exception

java.util.concurrent.ExecutionException: org.jenkinsci.remoting.protocol.impl.ConnectionRefusalException: XX:xxx:XXX:XXX is already connected to this master. Rejecting this connection.

at org.jenkinsci.remoting.util.SettableFuture.get(SettableFuture.java:223)

at hudson.remoting.Engine.innerRun(Engine.java:614)

at hudson.remoting.Engine.run(Engine.java:474)

Caused by: org.jenkinsci.remoting.protocol.impl.ConnectionRefusalException: XX:xxx:XXX:XXX is already connected to this master. Rejecting this connection.

at org.jenkinsci.remoting.protocol.impl.ConnectionHeadersFilterLayer.newAbortCause(ConnectionHeadersFilterLayer.java:378)

at org.jenkinsci.remoting.protocol.impl.ConnectionHeadersFilterLayer.onRecvClosed(ConnectionHeadersFilterLayer.java:433)

at org.jenkinsci.remoting.protocol.ProtocolStack$Ptr.onRecvClosed(ProtocolStack.java:816)

at org.jenkinsci.remoting.protocol.FilterLayer.onRecvClosed(FilterLayer.java:287)

at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.onRecvClosed(SSLEngineFilterLayer.java:172)

at org.jenkinsci.remoting.protocol.ProtocolStack$Ptr.onRecvClosed(ProtocolStack.java:816)

at org.jenkinsci.remoting.protocol.NetworkLayer.onRecvClosed(NetworkLayer.java:154)

at org.jenkinsci.remoting.protocol.impl.BIONetworkLayer.access$1500(BIONetworkLayer.java:48)

at org.jenkinsci.remoting.protocol.impl.BIONetworkLayer$Reader.run(BIONetworkLayer.java:247)

at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

at hudson.remoting.Engine$1.lambda$newThread$0(Engine.java:93)

at java.lang.Thread.run(Unknown Source)

Suppressed: java.nio.channels.ClosedChannelException

... 7 more

五月 07, 2019 3:49:47 上午 hudson.remoting.jnlp.Main$CuiListener status

信息: Connecting to XX:xxx:XXX:XXX:9909

五月 07, 2019 3:49:47 上午 hudson.remoting.jnlp.Main$CuiListener status

信息: Server reports protocol JNLP4-plaintext not supported, skipping

五月 07, 2019 3:49:47 上午 hudson.remoting.jnlp.Main$CuiListener status

信息: Server reports protocol JNLP3-connect not supported, skipping

五月 07, 2019 3:49:47 上午 hudson.remoting.jnlp.Main$CuiListener status

信息: Server reports protocol JNLP2-connect not supported, skipping

五月 07, 2019 3:49:47 上午 hudson.remoting.jnlp.Main$CuiListener status

信息: Server reports protocol JNLP-connect not supported, skipping

五月 07, 2019 3:49:47 上午 hudson.remoting.jnlp.Main$CuiListener erro

严重: The server rejected the connection: None of the protocols were accepted

java.lang.Exception: The server rejected the connection: None of the protocols were accepted

at hudson.remoting.Engine.onConnectionRejected(Engine.java:682)

at hudson.remoting.Engine.innerRun(Engine.java:639)

at hudson.remoting.Engine.run(Engine.java:474)