In the meantime i found a solution to the problem it is simply this
instruction
iptables -t nat -A PREROUTING -p tcp --dport 443 -j REDIRECT --to-port 5443
and th server.xml file can stay the same with port '5443'
For those who want to debugthe problem anyway here is some of the content
of the logfiles.
Starting with port 443 in server.xml
--------------------------------------------------
...Restarting...
Using CATALINA_BASE: /opt/open510
Using CATALINA_HOME: /opt/open510
Using CATALINA_TMPDIR: /opt/open510/temp
Using JRE_HOME: /usr
Using CLASSPATH:
/opt/open510/bin/bootstrap.jar:/opt/open510/bin/tomcat-juli.jar
Using CATALINA_OPTS:
Tomcat started.
14-Dec-2020 17:07:08.538 INFO [main]
org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web
application directory [/opt/open510/webapps/openmeetings] has finished in
[9,064] ms
14-Dec-2020 17:07:08.538 INFO [main]
org.apache.catalina.startup.HostConfig.deployDirectory Deploying web
application directory [/opt/open510/webapps/ROOT]
14-Dec-2020 17:07:08.545 INFO [main]
org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web
application directory [/opt/open510/webapps/ROOT] has finished in [7] ms
14-Dec-2020 17:07:08.548 INFO [main]
org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler
["http-nio-5080"]
14-Dec-2020 17:07:08.553 INFO [main]
org.apache.catalina.startup.Catalina.start Server startup in [9107]
milliseconds
starting with port 5443
---------------------------------
...Restarting...
Using CATALINA_BASE: /opt/open510
Using CATALINA_HOME: /opt/open510
Using CATALINA_TMPDIR: /opt/open510/temp
Using JRE_HOME: /usr
Using CLASSPATH:
/opt/open510/bin/bootstrap.jar:/opt/open510/bin/tomcat-juli.jar
Using CATALINA_OPTS:
Tomcat started.
14-Dec-2020 17:20:51.911 INFO [main]
org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web
application directory [/opt/open510/webapps/openmeetings] has finished in
[8,919] ms
14-Dec-2020 17:20:51.911 INFO [main]
org.apache.catalina.startup.HostConfig.deployDirectory Deploying web
application directory [/opt/open510/webapps/ROOT]
14-Dec-2020 17:20:51.919 INFO [main]
org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web
application directory [/opt/open510/webapps/ROOT] has finished in [8] ms
14-Dec-2020 17:20:51.921 INFO [main]
org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler
["http-nio-5080"]
14-Dec-2020 17:20:51.926 INFO [main]
org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler
["https-jsse-nio-5443"]
14-Dec-2020 17:20:51.934 INFO [main]
org.apache.catalina.startup.Catalina.start Server startup in [8969]
milliseconds
In the meantime I tried to change this file as well but had no effect
-----------------------------------------------------------------------------------------------
/opt/open510/webapps/openmeetings/WEB-INF/classes/hazelcast.xml.original:78:
<attribute name="server.url">https://127.0.0.1:5443/openmeetings
</attribute>
This is to my opinion the most relevant part of the catalina.out file
indicating the failure to start port 443
------------------------------------------------------------------------------------------------------
SEVERE [main]
org.apache.catalina.util.LifecycleBase.handleSubClassException Failed to
initialize component [Connector[HTTP/1.1-443]]
org.apache.catalina.LifecycleException: Protocol handler initialization
failed
at org.apache.catalina.connector.Connector.initInternal(Connector.java:1042)
at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:136)
at
org.apache.catalina.core.StandardService.initInternal(StandardService.java:533)
at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:136)
at
org.apache.catalina.core.StandardServer.initInternal(StandardServer.java:1057)
at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:136)
at org.apache.catalina.startup.Catalina.load(Catalina.java:724)
at org.apache.catalina.startup.Catalina.load(Catalina.java:746)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native
Method)
at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:302)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:472)
Caused by: java.net.SocketException: Permission denied
at java.base/sun.nio.ch.Net.bind0(Native Method)
at java.base/sun.nio.ch.Net.bind(Net.java:455)
at java.base/sun.nio.ch.Net.bind(Net.java:447)
at
java.base/sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:227)
at
java.base/sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:80)
at
org.apache.tomcat.util.net.NioEndpoint.initServerSocket(NioEndpoint.java:228)
at org.apache.tomcat.util.net.NioEndpoint.bind(NioEndpoint.java:211)
at
org.apache.tomcat.util.net.AbstractEndpoint.bindWithCleanup(AbstractEndpoint.java:1141)
at
org.apache.tomcat.util.net.AbstractEndpoint.init(AbstractEndpoint.java:1154)
at org.apache.coyote.AbstractProtocol.init(AbstractProtocol.java:592)
at
org.apache.coyote.http11.AbstractHttp11Protocol.init(AbstractHttp11Protocol.java:80)
at org.apache.catalina.connector.Connector.initInternal(Connector.java:1039)
... 13 more
