我在默认的 8080 上运行 Jenkins。服务在端口上受到监控。我偶尔会收到“无法访问端口 8080”的警报。当 ssh 连接到服务器时，“netstat”显示端口正在使用，“ps -aux”显示服务正在运行。重新启动服务后，问题得到解决。但是，当服务在该端口上运行且没有任何防火墙时，端口无法访问，这怎么可能呢？检查服务日志后，我得到了这个
INFO: Social-Cron-to-check-gnip-limit #439246 main build action completed: SUCCESS
Running from: /usr/lib/jenkins/jenkins.war
Jun 11, 2019 4:42:04 AM winstone.Logger logInternal
WARNING: Parameter handlerCountMax is now deprecated
Jun 11, 2019 4:42:04 AM winstone.Logger logInternal
WARNING: Parameter handlerCountMaxIdle is now deprecated
Jun 11, 2019 4:42:04 AM org.eclipse.jetty.util.log.Log initialized
INFO: Logging initialized @851ms to org.eclipse.jetty.util.log.JavaUtilLog
Jun 11, 2019 4:42:05 AM winstone.Logger logInternal
INFO: Beginning extraction from war file
Jun 11, 2019 4:42:05 AM org.eclipse.jetty.server.handler.ContextHandler setContextPath
WARNING: Empty contextPath
Jun 11, 2019 4:42:05 AM org.eclipse.jetty.server.Server doStart
INFO: jetty-9.4.z-SNAPSHOT; built: 2018-08-30T13:59:14.071Z; git: 272086856853232186989f695db2d7b21ebc51; jvm 1.8.0_171-b10
Jun 11, 2019 4:42:06 AM org.eclipse.jetty.webapp.StandardDescriptorProcessor visitServlet
INFO: NO JSP Support for /, did not find org.eclipse.jetty.jsp.JettyJspServlet
Jun 11, 2019 4:42:06 AM org.eclipse.jetty.server.session.DefaultSessionIdManager doStart
INFO: DefaultSessionIdManager workerName=node0
Jun 11, 2019 4:42:06 AM org.eclipse.jetty.server.session.DefaultSessionIdManager doStart
INFO: No SessionScavenger set, using defaults
Jun 11, 2019 4:42:06 AM org.eclipse.jetty.server.session.HouseKeeper startScavenging
INFO: node0 Scavenging every 660000ms
Jenkins home directory: /var/lib/jenkins found at: SystemProperties.getProperty("JENKINS_HOME")
Jun 11, 2019 4:42:08 AM org.eclipse.jetty.server.handler.ContextHandler doStart
INFO: Started w.@2e570ded{Jenkins v2.156,/,file:///var/cache/jenkins/war/,AVAILABLE}{/var/cache/jenkins/war}
Jun 11, 2019 4:42:08 AM org.eclipse.jetty.server.AbstractConnector doStart
INFO: Started ServerConnector@3cfdd820{HTTP/1.1,[http/1.1]}{0.0.0.0:8080}
Jun 11, 2019 4:42:08 AM org.eclipse.jetty.server.Server doStart
INFO: Started @4675ms
Jun 11, 2019 4:42:08 AM winstone.Logger logInternal
INFO: Winstone Servlet Engine v4.0 running: controlPort=disabled
Jun 11, 2019 4:42:11 AM jenkins.InitReactorRunner$1 onAttained
INFO: Started initialization
Jun 11, 2019 4:42:11 AM jenkins.InitReactorRunner$1 onAttained
Jun 11, 2019 4:42:18 AM jenkins.InitReactorRunner$1 onAttained
INFO: Prepared all plugins
Jun 11, 2019 4:42:18 AM jenkins.InitReactorRunner$1 onAttained
INFO: Started all plugins
Jun 11, 2019 4:42:21 AM jenkins.InitReactorRunner$1 onAttained
INFO: Augmented all extensions
Jun 11, 2019 4:42:21 AM jenkins.InitReactorRunner$1 onAttained
INFO: Loaded all jobs
Jun 11, 2019 4:42:22 AM hudson.model.AsyncPeriodicWork$1 run
INFO: Started Download metadata
Jun 11, 2019 4:42:22 AM hudson.model.AsyncPeriodicWork$1 run
INFO: Finished Download metadata. 3 ms
Jun 11, 2019 4:42:22 AM org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.web.context.support.StaticWebApplicationContext@2652a0c2: display name [Root WebApplicationContext]; startup date [Tue Jun 11 04:42:22 UTC 2019]; root of context hierarchy
Jun 11, 2019 4:42:22 AM org.springframework.context.support.AbstractApplicationContext obtainFreshBeanFactory
INFO: Bean factory for application context [org.springframework.web.context.support.StaticWebApplicationContext@2652a0c2]: org.springframework.beans.factory.support.DefaultListableBeanFactory@354c4643
Jun 11, 2019 4:42:22 AM org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@354c4643: defining beans [authenticationManager]; root of factory hierarchy
Jun 11, 2019 4:42:22 AM org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.web.context.support.StaticWebApplicationContext@2e78e11d: display name [Root WebApplicationContext]; startup date [Tue Jun 11 04:42:22 UTC 2019]; root of context hierarchy
Jun 11, 2019 4:42:22 AM org.springframework.context.support.AbstractApplicationContext obtainFreshBeanFactory
INFO: Bean factory for application context [org.springframework.web.context.support.StaticWebApplicationContext@2e78e11d]: org.springframework.beans.factory.support.DefaultListableBeanFactory@6f749996
Jun 11, 2019 4:42:22 AM org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@6f749676: defining beans [filter,legacy]; root of factory hierarchy
Jun 11, 2019 4:42:23 AM jenkins.InitReactorRunner$1 onAttained
INFO: Completed initialization
Jun 11, 2019 4:42:23 AM hudson.WebAppMain$3 run
INFO: Jenkins is fully up and running
Jun 11, 2019 4:42:23 AM hudson.model.Run execute
INFO: campaign_drip_cron #38917 main build action completed: SUCCESS
Jun 11, 2019 4:42:43 AM org.jenkinsci.plugins.prometheus.JobCollector getNamespace
INFO: The prometheus namespace is now [default]
Jun 11, 2019 4:43:01 AM hudson.model.Run execute
INFO: campaign_summary_cron #38630 main build action completed: SUCCESS
Jun 11, 2019 4:43:01 AM hudson.model.Run execute
INFO: campaign_drip_cron #38918 main build action completed: SUCCESS
Jun 11, 2019 4:43:01 AM hudson.model.Run execute
INFO: campaign_sms_cron #38676 main build action completed: SUCCESS
Jun 11, 2019 4:43:01 AM hudson.model.Run execute
INFO: campaign_SMS_DND #38658 main build action completed: SUCCESS
等等，服务重新启动，没有任何错误或提及任何内容。我不知道为什么会发生这种情况以及该怎么办。任何帮助都将不胜感激。提前致谢。