Hi Suvendu, not that I kew of (changes in JVM arguments). I will try your suggestion:
-Djava.net.preferIPv4Stack=true and thanks, it helped: I put it into /etc/defaults/tomcat9 (under Ubuntu 22.04) JAVA_OPTS="-Djava.awt.headless=true -Djava.net.preferIPv4Stack=true" and now I have: root@mail:/etc/default# lsof -i :8080 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME java 59579 tomcat 37u IPv4 579485 0t0 TCP *:http-alt (LISTEN) root@mail:/etc/default# -- Christoph > Am 28.11.2023 um 13:58 schrieb Suvendu Sekhar Mondal <suv3...@gmail.com>: > > Hello Christoph, > > On Tue, Nov 28, 2023, 5:55 PM Christoph Kukulies <k...@kukulies.org.invalid > <mailto:k...@kukulies.org.invalid>> > wrote: > >> I'm pulling my hairs on a suddenly occured - possibly - misconfiguration. >> But I can't find it out: >> >> catalina.2023-11-28.log: >> >> >> 28-Nov-2023 13:15:43.742 INFO [main] >> org.apache.catalina.startup.VersionLoggerListener.log Server version name: >> Apache Tomcat/9.0.58 (Ubuntu) >> 28-Nov-2023 13:15:43.743 INFO [main] >> org.apache.catalina.startup.VersionLoggerListener.log Server built: >> Jan 6 1970 15:09:28 UTC >> 28-Nov-2023 13:15:43.744 INFO [main] >> org.apache.catalina.startup.VersionLoggerListener.log Server version >> number: 9.0.58.0 >> 28-Nov-2023 13:15:43.744 INFO [main] >> org.apache.catalina.startup.VersionLoggerListener.log OS Name: >> Linux >> 28-Nov-2023 13:15:43.744 INFO [main] >> org.apache.catalina.startup.VersionLoggerListener.log OS Version: >> 5.15.0-89-generic >> 28-Nov-2023 13:15:43.745 INFO [main] >> org.apache.catalina.startup.VersionLoggerListener.log Architecture: >> amd64 >> 28-Nov-2023 13:15:43.745 INFO [main] >> org.apache.catalina.startup.VersionLoggerListener.log Java Home: >> /usr/lib/jvm/java-11-openjdk-amd64 >> 28-Nov-2023 13:15:43.745 INFO [main] >> org.apache.catalina.startup.VersionLoggerListener.log JVM Version: >> 11.0.20.1+1-post-Ubuntu-0ubuntu122.04 >> 28-Nov-2023 13:15:43.745 INFO [main] >> org.apache.catalina.startup.VersionLoggerListener.log JVM Vendor: >> Ubuntu >> 28-Nov-2023 13:15:43.746 INFO [main] >> org.apache.catalina.startup.VersionLoggerListener.log CATALINA_BASE: >> /var/lib/tomcat9 >> 28-Nov-2023 13:15:43.746 INFO [main] >> org.apache.catalina.startup.VersionLoggerListener.log CATALINA_HOME: >> /usr/share/tomcat9 >> 28-Nov-2023 13:15:43.758 INFO [main] >> org.apache.catalina.startup.VersionLoggerListener.log Command line >> argument: --add-opens=java.base/java.lang=ALL-UNNAMED >> 28-Nov-2023 13:15:43.759 INFO [main] >> org.apache.catalina.startup.VersionLoggerListener.log Command line >> argument: --add-opens=java.base/java.io=ALL-UNNAMED >> 28-Nov-2023 13:15:43.759 INFO [main] >> org.apache.catalina.startup.VersionLoggerListener.log Command line >> argument: --add-opens=java.base/java.util=ALL-UNNAMED >> 28-Nov-2023 13:15:43.760 INFO [main] >> org.apache.catalina.startup.VersionLoggerListener.log Command line >> argument: --add-opens=java.base/java.util.concurrent=ALL-UNNAMED >> 28-Nov-2023 13:15:43.760 INFO [main] >> org.apache.catalina.startup.VersionLoggerListener.log Command line >> argument: --add-opens=java.rmi/sun.rmi.transport=ALL-UNNAMED >> 28-Nov-2023 13:15:43.760 INFO [main] >> org.apache.catalina.startup.VersionLoggerListener.log Command line >> argument: >> -Djava.util.logging.config.file=/var/lib/tomcat9/conf/logging.properties >> 28-Nov-2023 13:15:43.761 INFO [main] >> org.apache.catalina.startup.VersionLoggerListener.log Command line >> argument: -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager >> 28-Nov-2023 13:15:43.761 INFO [main] >> org.apache.catalina.startup.VersionLoggerListener.log Command line >> argument: -Djava.awt.headless=true >> 28-Nov-2023 13:15:43.761 INFO [main] >> org.apache.catalina.startup.VersionLoggerListener.log Command line >> argument: -Djdk.tls.ephemeralDHKeySize=2048 >> 28-Nov-2023 13:15:43.761 INFO [main] >> org.apache.catalina.startup.VersionLoggerListener.log Command line >> argument: -Djava.protocol.handler.pkgs=org.apache.catalina.webresources >> 28-Nov-2023 13:15:43.762 INFO [main] >> org.apache.catalina.startup.VersionLoggerListener.log Command line >> argument: -Dorg.apache.catalina.security.SecurityListener.UMASK=0027 >> 28-Nov-2023 13:15:43.762 INFO [main] >> org.apache.catalina.startup.VersionLoggerListener.log Command line >> argument: -Dignore.endorsed.dirs= >> 28-Nov-2023 13:15:43.762 INFO [main] >> org.apache.catalina.startup.VersionLoggerListener.log Command line >> argument: -Dcatalina.base=/var/lib/tomcat9 >> 28-Nov-2023 13:15:43.762 INFO [main] >> org.apache.catalina.startup.VersionLoggerListener.log Command line >> argument: -Dcatalina.home=/usr/share/tomcat9 >> 28-Nov-2023 13:15:43.763 INFO [main] >> org.apache.catalina.startup.VersionLoggerListener.log Command line >> argument: -Djava.io.tmpdir=/tmp >> 28-Nov-2023 13:15:43.768 INFO [main] >> org.apache.catalina.core.AprLifecycleListener.lifecycleEvent Loaded Apache >> Tomcat Native library [1.2.31] using APR version [1.7.0]. >> 28-Nov-2023 13:15:43.769 INFO [main] >> org.apache.catalina.core.AprLifecycleListener.lifecycleEvent APR >> capabilities: IPv6 [true], sendfile [true], accept filters [false], random >> [true], UDS [true]. >> 28-Nov-2023 13:15:43.771 INFO [main] >> org.apache.catalina.core.AprLifecycleListener.lifecycleEvent APR/OpenSSL >> configuration: useAprConnector [false], useOpenSSL [true] >> 28-Nov-2023 13:15:43.776 INFO [main] >> org.apache.catalina.core.AprLifecycleListener.initializeSSL OpenSSL >> successfully initialized [OpenSSL 3.0.2 15 Mar 2022] >> 28-Nov-2023 13:15:44.229 INFO [main] >> org.apache.coyote.AbstractProtocol.init Initializing ProtocolHandler >> ["http-nio-8080"] >> 28-Nov-2023 13:15:44.268 INFO [main] >> org.apache.catalina.startup.Catalina.load Server initialization in [799] >> milliseconds >> 28-Nov-2023 13:15:44.328 INFO [main] >> org.apache.catalina.core.StandardService.startInternal Starting service >> [Catalina] >> 28-Nov-2023 13:15:44.328 INFO [main] >> org.apache.catalina.core.StandardEngine.startInternal Starting Servlet >> engine: [Apache Tomcat/9.0.58 (Ubuntu)] >> 28-Nov-2023 13:15:44.345 INFO [main] >> org.apache.catalina.startup.HostConfig.deployWAR Deploying web application >> archive [/var/lib/tomcat9/webapps/ROOT.war] >> 28-Nov-2023 13:15:54.672 INFO [main] >> org.apache.jasper.servlet.TldScanner.scanJars At least one JAR was scanned >> for TLDs yet contained no TLDs. Enable debug logging for this logger for a >> complete list of JARs that were scanned but no TLDs were found in them. >> Skipping unneeded JARs during scanning can improve startup time and JSP >> compilation time. >> 28-Nov-2023 13:16:08.279 INFO [main] >> org.apache.catalina.startup.HostConfig.deployWAR Deployment of web >> application archive [/var/lib/tomcat9/webapps/ROOT.war] has finished in >> [23,934] ms >> 28-Nov-2023 13:16:08.282 INFO [main] >> org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler >> ["http-nio-8080"] >> 28-Nov-2023 13:16:08.302 INFO [main] >> org.apache.catalina.startup.Catalina.start Server startup in [24033] >> milliseconds >> >> root@mail:/var/lib/tomcat9/logs# lsof -i :8080 >> COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME >> java 58986 tomcat 37u IPv6 571175 0t0 TCP *:http-alt (LISTEN) >> root@mail:/var/lib/tomcat9/logs# >> >> >> As a result my frontend server (haproxy) cannot connect to the tomcat9 >> backend server. What's wrong? >> > > Was there any change in JVM arguments recently? > > You can force JVM to use IPv4 by adding following argument: > > -Djava.net.preferIPv4Stack=true
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