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Synchrony is not starting up Edited


As I finally moved to my own nginx reverse-proxy, I thought I should be able to run Synchrony.

Unfortunaltely, synchrony is not starting. I have the same message as this person here: who in the end was advised to also open a ticket.

My setup is as follows:

- Confluence is running as a docker container in an ubuntu server (VM)

- The data for confluence is on an NFS share

- As database, a Postgresql Docker container is used

- Nginx reverse proxy is used to redirect to confluence

The confluence instance is directly reachable from the web with a subdomain (without the /confluence subpath), which redirects internally to http with port 8090.

I tried already what was mentioned in the thread above (removing the plugin caches). That did not help.

Thanks for your help

1 answer

0 votes
brbojorque Community Leader Jan 13, 2020

Hi @roman_baeriswyl ,

May I know what version is your Confluence to start with?

Synchrony port is 8091 please make sure that your forward the synchrony request in nginx.


I use the latest (7.1.0), I have updated it several times as it is running for quite a while now (I think it started with one of the first 6.x version).

Here is my current nginx script:


server {
    listen 443 ssl;

    include conf.d/ssl.conf;

    location / {
      proxy_pass http://<ip>:8090;
      client_max_body_size 100m;
      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;

    location /synchrony {
      proxy_pass http://<ip>:8091/synchrony;
      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_http_version 1.1;
      proxy_set_header Upgrade $http_upgrade;
      proxy_set_header Connection "Upgrade";


The main problem is that synchrony is not even starting as it throws the same exception as in the thread I linked above.

Hi @roman_baeriswyl ,

It looks good, maybe this is environment issue please attach your atlassian-confluence.log, also please sanitize it so sensitive data will not be included.


I remember 6.13.x has the stable version of Synchrony, for the latter there are stuff to do to make it work.

The logs can be found here: <hidden> 

brbojorque Community Leader Jan 13, 2020

Hi @roman_baeriswyl ,

It looks like it is related to Java.

Check your java version if it is updated, preferably Java 8.

Well I'm using the official confluence server docker image (

I just updated from 7.2.0 to 7.2.1 which was released yesterday. Still the same, I cannot enable Synchrony, it just stays "off"

Startup log says:

Java Home: /opt/java/openjdk

JVM Version: 11.0.5+10

JVM Vendor: AdoptOpenJDK 

brbojorque Community Leader Jan 13, 2020

Hi @roman_baeriswyl ,

If your License does not expire yet your can create a support ticket to Atlassian.

Link your question here and they should be able to know what is going on in the instance.

Docker related issues are supported aswell.

It is a starter licence (still valid as I renewed it several times) but Atlassian does only support starters via this community channel here.

Any more ideas what could be the cause?

brbojorque Community Leader Jan 14, 2020

Hi @roman_baeriswyl ,

I tried to spin up a docker container with an image.

 image: atlassian/confluence-server:7.2.1-jdk11

It seems to be working fine on my end.

2020-01-14 12:59:34,313 INFO [synchrony-interop-executor:thread-2] [plugins.synchrony.bootstrap.DefaultSynchronyProcessManager] debugPrintEnvironment /opt/java/openjdk/bin/java -classpath /opt/atlassian/confluence/temp/3.1.0-master-0f086db5.jar:/opt/atlassian/confluence/confluence/WEB-INF/lib/h2-1.4.196.jar -Xss2048k -Xmx1g synchrony.core sql
2020-01-14 12:59:34,373 INFO [synchrony-interop-executor:thread-1] [plugins.synchrony.bootstrap.DefaultSynchronyProcessManager] isSynchronyProxyEnabled proxy port present: false
2020-01-14 12:59:34,373 INFO [synchrony-interop-executor:thread-1] [plugins.synchrony.bootstrap.DefaultSynchronyProcessManager] isSynchronyProxyEnabled app config synchrony.proxy.enabled: true
2020-01-14 12:59:34,382 INFO [synchrony-interop-executor:thread-1] [plugins.synchrony.bootstrap.DefaultSynchronyProcessManager] updateSynchronyConfiguration Synchrony External Base URL:,
2020-01-14 12:59:34,382 INFO [synchrony-interop-executor:thread-1] [plugins.synchrony.bootstrap.DefaultSynchronyProcessManager] updateSynchronyConfiguration Synchrony External Service URL:
2020-01-14 12:59:34,382 INFO [synchrony-interop-executor:thread-1] [plugins.synchrony.bootstrap.DefaultSynchronyProcessManager] updateSynchronyConfiguration Synchrony Internal Service URL:
2020-01-14 12:59:43,605 WARN [synchrony-interop-executor:thread-3] [plugins.synchrony.config.DefaultSynchronyConfigurationManager] enableSharedDrafts [Collab editing plugin] Enabling Shared Drafts 

Try to narrow down the issue by disabling the nginx proxy and access it using


If it works without reverse proxy then the issue is the nginx. 

I changed the base-url to http://<ip>:8090 and removed the environment variables


From the docker container and restarted it. Still the same issue, I cannot start Collaborative editing, it stays "off" and throws the exception. Could it be because this instance was already updated from several versions of confluence?

I actually just created a complete new container (with the same settings and same volumes) but that did not help as well. I suspect it is some configuration in confluence-cfg.xml or something.

I created a complete new confluence server with the data volume on an NFS share. Same issue. Then I created a new confluence server with a local data volume, then it works! Not sure yet what the issue is when the data is on an NFS share. I might also try an iSCSI share next to see if at least that works.

brbojorque Community Leader Jan 14, 2020

Hi @roman_baeriswyl ,

That is good to hear, so the issue is not application related hence infrastructure. In my test, it is a local volume.

As a final verdict, I gave up using Confluence on an NFS share. I moved my main instance locally and do regular backups to an NFS share.

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