I have PCF Dev environment running inside Virtualbox  5.1 and Jenkins (2.0) is running as application container inside PCF Dev by executing PCF CLI command  as "cf push -p jenkins.war -b https://github.com/Altoros/jenkins-buildpack -m 2G jenkins". Now I can launch jenkins instance(http://jenkins.local.pcfdev.io) in browser.

Here is link I have refered for
https://github.com/Altoros/cf-example-jenkins

As I would like to push other sample applications to PCF Dev through Jenkins, Cloud Foundry plugin 2.0.0 is installed in Jenkins. From builds actions in Jenkins dashboards, it try to connect PCF Dev target but it fails with below error messages. But from host (PCF Dev) I can still connect Jenkins container through ssh protocol like "cf ssh jenkins" 

Unknown error
Also: reactor.core.publisher.FluxOnAssembly$OnAssemblyException:
Assembly trace from producer [reactor.core.publisher.MonoPeek] :
reactor.core.publisher.Mono.checkpoint(Mono.java:1400)
org.cloudfoundry.reactor.client.v2.info.ReactorInfo.get(ReactorInfo.java:47)
com.hpe.cloudfoundryjenkins.CloudFoundryUtils.doTestConnection(CloudFoundryUtils.java:126)
com.hpe.cloudfoundryjenkins.AbstractCloudFoundryPushDescriptor.doTestConnection(AbstractCloudFoundryPushDescriptor.java:105)
java.lang.invoke.MethodHandle.invokeWithArguments(MethodHandle.java:627)
org.kohsuke.stapler.Function$MethodFunction.invoke(Function.java:343)
org.kohsuke.stapler.Function.bindAndInvoke(Function.java:184)
org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:117)
org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:129)
org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)
org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:715)
org.kohsuke.stapler.Stapler.invoke(Stapler.java:845)
org.kohsuke.stapler.MetaClass$5.doDispatch(MetaClass.java:248)
org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)
org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:715)
org.kohsuke.stapler.Stapler.invoke(Stapler.java:845)
org.kohsuke.stapler.MetaClass$5.doDispatch(MetaClass.java:248)
org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)
org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:715)
org.kohsuke.stapler.Stapler.invoke(Stapler.java:845)
org.kohsuke.stapler.Stapler.invoke(Stapler.java:649)
org.kohsuke.stapler.Stapler.service(Stapler.java:238)
javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:841)
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1650)
hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:154)
hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:157)
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:99)
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)
hudson.security.UnwrapSecurityExceptionFilter.doFilter(UnwrapSecurityExceptionFilter.java:51)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
jenkins.security.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:117)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
org.acegisecurity.ui.rememberme.RememberMeProcessingFilter.doFilter(RememberMeProcessingFilter.java:142)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:271)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
jenkins.security.BasicHeaderProcessor.doFilter(BasicHeaderProcessor.java:93)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249)
hudson.security.HttpSessionContextIntegrationFilter2.doFilter(HttpSessionContextIntegrationFilter2.java:67)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:90)
hudson.security.HudsonFilter.doFilter(HudsonFilter.java:171)
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:49)
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:82)
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
org.kohsuke.stapler.DiagnosticThreadNameFilter.doFilter(DiagnosticThreadNameFilter.java:30)
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:533)
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524)
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:190)
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595)
org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:188)
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1253)
org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:168)
org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473)
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564)
org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:166)
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1155)
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
org.eclipse.jetty.server.Server.handle(Server.java:564)
org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:317)
org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251)
org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:279)
org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:110)
org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:124)
org.eclipse.jetty.util.thread.Invocable.invokePreferred(Invocable.java:128)
org.eclipse.jetty.util.thread.Invocable$InvocableExecutor.invoke(Invocable.java:222)
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:294)
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:199)
winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77)
Error has been observed by the following operator(s):

io.netty.handler.proxy.ProxyConnectException: http, none, /16.85.88.10:8080 => api.local.pcfdev.io:443, timeout
at io.netty.handler.proxy.ProxyHandler$2.run(ProxyHandler.java:201)
at io.netty.util.concurrent.PromiseTask$RunnableAdapter.call(PromiseTask.java:38)
at io.netty.util.concurrent.ScheduledFutureTask.run(ScheduledFutureTask.java:120)
at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163)
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:403)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:463)
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858)
Also: java.lang.Exception: #block terminated with an error
at reactor.core.publisher.BlockingSingleSubscriber.blockingGet(BlockingSingleSubscriber.java:86)
Caused: reactor.core.Exceptions$ReactiveException
at reactor.core.Exceptions.propagate(Exceptions.java:219)
at reactor.core.publisher.BlockingSingleSubscriber.blockingGet(BlockingSingleSubscriber.java:85)
at reactor.core.publisher.Mono.block(Mono.java:1301)
at com.hpe.cloudfoundryjenkins.CloudFoundryUtils.doTestConnection(CloudFoundryUtils.java:128)
at com.hpe.cloudfoundryjenkins.AbstractCloudFoundryPushDescriptor.doTestConnection(AbstractCloudFoundryPushDescriptor.java:105)
at java.lang.invoke.MethodHandle.invokeWithArguments(MethodHandle.java:627)
at org.kohsuke.stapler.Function$MethodFunction.invoke(Function.java:343)
at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:184)
at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:117)
at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:129)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:715)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:845)
at org.kohsuke.stapler.MetaClass$5.doDispatch(MetaClass.java:248)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:715)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:845)
at org.kohsuke.stapler.MetaClass$5.doDispatch(MetaClass.java:248)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:715)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:845)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:649)
at org.kohsuke.stapler.Stapler.service(Stapler.java:238)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:841)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1650)
at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:154)
at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:157)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:99)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)
at hudson.security.UnwrapSecurityExceptionFilter.doFilter(UnwrapSecurityExceptionFilter.java:51)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at jenkins.security.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:117)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at org.acegisecurity.ui.rememberme.RememberMeProcessingFilter.doFilter(RememberMeProcessingFilter.java:142)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:271)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at jenkins.security.BasicHeaderProcessor.doFilter(BasicHeaderProcessor.java:93)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249)
at hudson.security.HttpSessionContextIntegrationFilter2.doFilter(HttpSessionContextIntegrationFilter2.java:67)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:90)
at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:171)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:49)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:82)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
at org.kohsuke.stapler.DiagnosticThreadNameFilter.doFilter(DiagnosticThreadNameFilter.java:30)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:533)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:190)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595)
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:188)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1253)
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:168)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564)
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:166)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1155)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
at org.eclipse.jetty.server.Server.handle(Server.java:564)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:317)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:279)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:110)
at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:124)
at org.eclipse.jetty.util.thread.Invocable.invokePreferred(Invocable.java:128)
at org.eclipse.jetty.util.thread.Invocable$InvocableExecutor.invoke(Invocable.java:222)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:294)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:199)
at winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

could anyone help me if similar issue is observed before.  

Regards
Soibam