Hi Christopher, That was my connector:
<Connector port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443" />
I tried netstat -tulpn as well and it could be seen there was no listener
under ip4 and port 8080.
Thanks,
--
Christoph
> Am 28.11.2023 um 15:15 schrieb Christopher Schultz
> <ch...@christopherschultz.net>:
>
> Christoph,
>
> On 11/28/23 08:26, Christoph Kukulies wrote:
>> 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#
>
> So... is that what you wanted?
>
> What does your <Connector> configuration look like?
>
> Try using netstat instead of lsof. It will show you the network interface
> being used as well as the port number and IP stack type.
>
> -chris
>
>>> Am 28.11.2023 um 13:58 schrieb Suvendu Sekhar Mondal <suv3...@gmail.com
>>> <mailto: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 <http://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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