[HELP needed] Apache reverse proxy -> Openmeetings 6 (Tomcat)

[jox joe]

OM 6
Apache Tomcat/9.0.43
Ubuntu 18.4 server
Apache Web Server 2.4.29
traditional install based on Alvaro's PDFs
I used JKS for SSL.

I did this after a long internet research:
***************
@@@@server.xml:

    <Connector port="5080" protocol="HTTP/1.1"
               connectionTimeout="20000"
               redirectPort="5443" />

    <Connector port="5443" protocol="HTTP/1.1"
               maxThreads="150" SSLEnabled="false" name="secure"
value="true"    >
    </Connector>


<Valve className="org.apache.catalina.valves.RemoteIpValve"
           remoteIpHeader="x-forwarded-for"
           remoteIpProxiesHeader="x-forwarded-by"
           protocolHeader="x-forwarded-proto"
    />

*****************
@@@@default-ssl.config
Apache web server Apache/2.4.29 (Ubuntu)

## Custom fragment
RewriteEngine On
RewriteCond %{HTTP:Connection} Upgrade [NC]
RewriteCond %{HTTP:Upgrade} websocket [NC]
RewriteRule /(.*) ws://localhost:5443/$1 [P,L]
RedirectMatch ^/$ http://localhost/openmeetings
ProxyPreserveHost On

<Location /openmeetings>
  Require all granted
  ProxyPass http://localhost:5443/openmeetings
  ProxyPassReverse http://localhost:5443/openmeetings
  RewriteEngine On
  RewriteRule ^/(.*) http://localhost:5443/$1 [P]
</Location>
******************
@@@@RESULT:

Openmeetings.log

DEBUG 01-08 14:06:53.813 o.a.o.w.a.WebSession:223 [nio-5443-exec-4]
 - checkHashes, secure: 'null', invitation: 'null'
DEBUG 01-08 14:06:53.813 o.a.o.w.a.WebSession:225 [nio-5443-exec-4]
 - checkHashes, has soap in session ? 'false'
INFO 01-08 14:06:54.707 o.a.w.p.h.CsrfPreventionRequestCycleListener
 :591 [nio-5443-exec-5] - Possible CSRF attack, request URL:

I can see the login pop-up window but I can't login.
Network test is not working.

NOTE:
SSL certificate installed only on Apache webserver.
Between Apache webserver and OM-Tomcat no SSL is needed.

@@@@QUESTION 1:
What should I do to make it work?

QUESTION 2:
How can I change the Tomcat port
from 5443 to 443. I tried but no succes;
it worked with OM 5.

Thank you for your help.