After updating to Confluence 7.19.4, Unable to connect to websocket.

[KubotaDaisuke]

Updated from 8.13.3 to 7.19.4.
Collaborative editing worked fine in 8.13.3,
but after updating to 7.19.4, I can't connect to websocket and can't create pages.
My configuration is below.

• AWS ALB > apache > Confluence.
• Apache 2.4.54
• Confluence uses context path(/wiki).

server.xml has the same settings as in 8.13.3.

<Connector port="8090" connectionTimeout="20000" redirectPort="8443"
maxThreads="400" maxPostSize="16777216" minSpareThreads="10" maxParameterCount="5000"
enableLookups="false" acceptCount="10" URIEncoding="UTF-8"
protocol="org.apache.coyote.http11.Http11NioProtocol"
scheme="https" secure="true" proxyName="{domain_name}" proxyPort="443"/>

<Engine name="Standalone" defaultHost="localhost">
<Host name="localhost" appBase="webapps" unpackWARs="true" autoDeploy="false" startStopThreads="4">
<Context path="/wiki" docBase="../confluence" 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"/>

<!-- http://tomcat.apache.org/tomcat-9.0-doc/config/valve.html#Access_Log_Valve -->
<Valve className="org.apache.catalina.valves.AccessLogValve"
directory="logs"
maxDays="30"
pattern="%t %{X-AUSERNAME}o %I %h %r %s %Dms %b %{Referer}i %{User-Agent}i"
prefix="conf_access_log"
requestAttributesEnabled="true"
rotatable="true"
suffix=".log"
/>

<!-- http://tomcat.apache.org/tomcat-9.0-doc/config/valve.html#Remote_IP_Valve -->
<Valve className="org.apache.catalina.valves.RemoteIpValve" />
</Context>

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

No changed any apache settings.

# Synchrony
ProxyRequests Off
ProxyPreserveHost On

ProxyPass /synchrony http://{IP Address}:{synchrony port}/synchrony retry=1 acquire=3000 timeout=600
ProxyPassReverse /synchrony http://{IP Address}:{synchrony port}/synchrony

<Location /synchrony>
RewriteEngine on
RewriteCond %{HTTP:UPGRADE} ^WebSocket$ [NC]
RewriteCond %{HTTP:CONNECTION} Upgrade$ [NC]
RewriteRule .* ws://{IP Address}:{synchrony port}/%{REQUEST_URI} [P]
</Location>

# Confluence Server
ProxyPass /wiki http://{IP Address}:{confluence port}/wiki retry=1 acquire=3000 timeout=600
ProxyPassReverse /wiki http://{IP Address}:{confluence port}/wiki

I reconfirmed the apache settings with to the following reference, but I felt that there was no problem.
https://confluence.atlassian.com/doc/using-apache-with-mod_proxy-173669.html

Please let me know if you have any advice on settings that work properly.

Regards,

[KubotaDaisuke]

I'm sorry. It's a typo.
Update from 7.4.11 to 7.19.4.

[Mirek]

Hi @KubotaDaisuke ,

Just to make sure.. since it is hard to imagine how actually you can upgrade Confluence from a version that actually does not exist yet (8.13.3). Is this a mistake and you have in mind 7.13.3?