Confluence server not listening on 8443 after https configuration

[Deleted user]

My server is not listening on port 8443. 
I followed this walkthrough:
https://confluence.atlassian.com/doc/running-confluence-over-ssl-or-https-161203.html

sudo netstat -taplnu | grep 8443
-- nothing

The firewall is off

I've tried restarting the device several times and confluence. The normal port 8090 works fine.

server.xml:

<Server port="8000" shutdown="SHUTDOWN" debug="0">
<Service name="Tomcat-Standalone">

<Connector port="8090" connectionTimeout="20000" redirectPort="8443"
maxThreads="48" minSpareThreads="10"
enableLookups="false" acceptCount="10" debug="0" URIEncoding="UTF-8"
protocol="org.apache.coyote.http11.Http11NioProtocol"/>

<Connector port="*8443" maxHttpHeaderSize="8192"
maxThreads="150" minSpareThreads="25"
protocol="org.apache.coyote.http11.Http11Nio2Protocol"
enableLookups="false" disableUploadTimeout="true"
acceptCount="100" scheme="https" secure="true"
clientAuth="false" sslProtocol="TLSv1.2" sslEnabledProtocols="TLSv1.2" SSLEnabled="true"
URIEncoding="UTF-8" keystorePass="pyramids-undone-excellence"/>
keystoreFile="/home/user/.keystore"/>

<Engine name="Standalone" defaultHost="localhost" debug="0">
<Host name="localhost" debug="0" appBase="webapps" unpackWARs="true" autoDeploy="false" startStopThreads="4">
<Context path="" docBase="../confluence" debug="0" reloadable="false" useHttpOnly="true">
<!-- Logging configuration for Confluence is specified in confluence/WEB-INF/classes/log4j.properties -->
<Manager pathname=""/>
<Valve className="org.apache.catalina.valves.StuckThreadDetectionValve" threshold="60"/>
</Context>

<Context path="${confluence.context.path}/synchrony-proxy" docBase="../synchrony-proxy" debug="0"
reloadable="false" useHttpOnly="true">
<Valve className="org.apache.catalina.valves.StuckThreadDetectionValve" threshold="60"/>
</Context>
</Host>
</Engine>
</Service>
</Server>

The service is running:

● confluence.service - Confluence
Loaded: loaded (/lib/systemd/system/confluence.service; enabled; vendor preset: enabled)
Active: active (running) since Wed 2020-10-14 18:53:28 EDT; 6min ago
Process: 3508 ExecStart=/opt/atlassian/confluence/bin/start-confluence.sh (code=exited, status=0/SUCCESS)
Main PID: 3562 (java)
Tasks: 231 (limit: 4915)
Memory: 2.4G
CGroup: /system.slice/confluence.service
├─3562 /opt/atlassian/confluence/jre//bin/java -Djava.util.logging.config.file=/opt/atlassian/confluence/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dorg.apache.ca
└─3840 /opt/atlassian/confluence/jre/bin/java -classpath /opt/atlassian/confluence/temp/3.1.0-master-022ca438.jar:/opt/atlassian/confluence/confluence/WEB-INF/lib/h2-1.4.196.jar -Xss2048k -Xmx1g synchrony.core sql

[Nic Brough -Adaptavist-]

*8443 isn't a valid port, try it with 8443 instead.

I'm sorry, that seems terse, I was too quick with the <enter> key.   I wanted to say that the chunk of config file that you've given us seems broadly correct, but the port setting is invalid, so Tomcat is ignoring it - port="x" needs to have a plain number, but I think you've miskeyed a * into it.

[Deleted user]

<Connector port="8443" maxHttpHeaderSize="8192"
maxThreads="150" minSpareThreads="25"
protocol="org.apache.coyote.http11.Http11Nio2Protocol"
enableLookups="false" disableUploadTimeout="true"
acceptCount="100" scheme="https" secure="true"
clientAuth="false" sslProtocol="TLSv1.2" sslEnabledProtocols="TLSv1.2" SSLEnabled="true"
URIEncoding="UTF-8" keystorePass="pyramids-undone-excellence"/>
keystoreFile="/home/user/.keystore"/>

After restarting the device and the confluence service,
sudo netstat -taplnu | grep 8443
-- still nothing

[Deleted user]

I found the exact cause:

15-Oct-2020 18:52:29.749 SEVERE [main] org.apache.catalina.util.LifecycleBase.handleSubClassException Failed to initialize component [Connector[org.apache.coyote.http11.Http11Nio2Protocol-8443]]

I have no clue how to fix this.
The keystore file is in the correct place:
-rw-r--r-- 1 user user 2639 Oct 15 18:50 /home/user/.keystore

[Nic Brough -Adaptavist-]

That is not the "exact cause", there's a whole load of related error messages around that which might tell you a lot more.

Could you look at the application log instead?  I'd like to see what Confluence is trying to do as it starts up, so look to <confluence home>/log/atlassian-confluence.log (ideally, stop all confluence processes, clean out the log directory by moving the current files out, and try restarting it.  This will give you a single set of logs that you know is all about the current start up)