need to change the port for accessing synchrony

This question is in reference to Atlassian Documentation: Administering Collaborative Editing

Hello all,

if we use the default config for synchrony, the internal proxy has problems to access the localhost because confluence is running in a docker and internal proxy should prefer confluence:8091/... for localhost:8091 to access the synchrony. If we proxy the requests to synchrony via nginx and disable the internal confluence proxy, such config works as expected with the one exception: confluence generates synchrony urls with port :8091 and this port should be opened extra on a host machine. The responses from :8091/synchrony and :80/synchrony are now the same and both work well, but the web pages want to go to :8091.

We would like either to say the confluence to access  synchrony via internal proxy under the specific hostname (eg. confluence:8091) or to say what port should be used to access the synchrony, if the internal proxy is disabled (in our case 80).

We use confluence 6.0.1 in Docker + Oracle JDK 8

Any hints would be appreciated!

Kind regard,



3 answers

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Synchrony's port can be specified with -Dreza.port (not -Dsynchrony.port - see

I'm not sure I follow re. confluence:8091. Synchrony binds to :8091 on all interfaces by default. Confluence (6.0.2 anyway) hardcodes 'localhost' in its 'Synchrony Internal Service URL' - see

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We are on 6.0.3 in a docker now. The synchrony proxy is enabled. Following nginx configuration works (important is the location /synchrony-proxy):

location /synchrony-proxy {
        proxy_set_header X-Forwarded-Host $host;
        proxy_set_header X-Forwarded-Server $host;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_pass http://confluence:8091/synchrony;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "Upgrade";
 location / {
                proxy_set_header Host $http_host;
                proxy_set_header X-Real-IP $remote_addr;
                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                proxy_redirect off;
                proxy_pass http://confluence-backend;
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Port is configurable by adding the following line (say your preferred port is 9004) to /bin/

CATALINA_OPTS="-Dsynchrony.port=9004 ${CATALINA_OPTS}"



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