Hi community, after reading through "tons" of information I'm still not able to get this work properly. So I decided to ask you all for help. Here's some additional Information: * Server* Hoster: Strato (DE) * OS: Ubuntu 16.04.3 LTS * Plesk Onyx 17.5.3 * Confluence 6.6.2 * Apache 2.4.18 * Subdomain certified trough Let's encrypt (Plesk) * Status quo* After a few seconds the editor throws the following message The editor didn't load this time The connection timed out. If it happens again, speak to your Confluence admin. You may be using a proxy server that prevents WebSocket connections. * Reverse-Proxy Configuration ServerName sub.domain.tld ProxyRequests Off ProxyPreserveHost On RewriteEngine On RewriteCond %{REQUEST_URI} !^/synchrony RewriteRule ^/(.*) http://127.0.0.1:8090/$1 [P] Require all granted ProxyPass /synchrony http://127.0.0.1:8091/synchrony Require all granted RewriteEngine on RewriteCond %{HTTP:UPGRADE} ^WebSocket$ [NC] RewriteCond %{HTTP:CONNECTION} Upgrade$ [NC] RewriteRule .* ws://127.0.0.1:8091%{REQUEST_URI} [P] ProxyPass / http://127.0.0.1:8090 ProxyPassReverse / http://127.0.0.1:8090 Require all granted Any help would be appreciated! Regards Nicolas

Hi Nicholas, The error you are reporting is usually related to a lack of WebSocket support as described in Confluence throws The editor didn't load this time error when trying to edit a page. Please see that doc for diagnostic and resolution steps. I checked your proxy configuration against the one for Confluence 6.x on Proxying Atlassian server applications with Apache HTTP Server (mod_proxy_http) and wanted to ask about these lines on yours that are either not in the document or are under the /synchrony location: RewriteEngine On RewriteCond %{REQUEST_URI} !^/synchrony RewriteRule ^/(.*) http://127.0.0.1:8090/$1 [P] * Please check whether editing will work if those lines are removed. * To help construct proper redirect URLs, please make sure the /conf/server.xml file has the proxyName proxyPort and scheme in the connector directive. (Proxy Support) For each application, find the normal (non-SSL) Connector directive in the Tomcat server.xml file, and add the scheme, proxyName, and proxyPort attributes inside the Connector directive, as below. Use the default values for the other attributes, including for port , unless you have a particular reason to change them, and use your own domain name for the proxyName value: Connector port= maxThreads= minSpareThreads= connectionTimeout= enableLookups= maxHttpHeaderSize= protocol= useBodyEncodingForURI= redirectPort= acceptCount= disableUploadTimeout= proxyName=" . .com" proxyPort="80" scheme="http"/> Thanks, Ann

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How can I get Synchrony to work behind a reverse Proxy?

Nicolas Rehner

Hi community,

after reading through "tons" of information I'm still not able to get this work properly. So I decided to ask you all for help.

Here's some additional Information:

Server
- Hoster: Strato (DE)
- OS: Ubuntu 16.04.3 LTS
- Plesk Onyx 17.5.3
- Confluence 6.6.2
- Apache 2.4.18
- Subdomain certified trough Let's encrypt (Plesk)
Status quo
- After a few seconds the editor throws the following message

The editor didn't load this time

The connection timed out. If it happens again, speak to your Confluence admin. You may be using a proxy server that prevents WebSocket connections.

Reverse-Proxy Configuration

ServerName sub.domain.tld

ProxyRequests Off
ProxyPreserveHost On

RewriteEngine On
RewriteCond %{REQUEST_URI} !^/synchrony
RewriteRule ^/(.*) http://127.0.0.1:8090/$1 [P]

<Proxy *>
 Require all granted
</Proxy>

ProxyPass /synchrony http://127.0.0.1:8091/synchrony

<Location /synchrony>
 Require all granted
 RewriteEngine on
 RewriteCond %{HTTP:UPGRADE} ^WebSocket$ [NC]
 RewriteCond %{HTTP:CONNECTION} Upgrade$ [NC]
 RewriteRule .* ws://127.0.0.1:8091%{REQUEST_URI} [P]
</Location>

ProxyPass / http://127.0.0.1:8090
ProxyPassReverse / http://127.0.0.1:8090

<Location />
 Require all granted
</Location>

Any help would be appreciated!

Regards Nicolas

Accepted answers

AnnWorley

Hi Nicholas,

The error you are reporting is usually related to a lack of WebSocket support as described in Confluence throws The editor didn't load this time error when trying to edit a page. Please see that doc for diagnostic and resolution steps.

I checked your proxy configuration against the one for Confluence 6.x on Proxying Atlassian server applications with Apache HTTP Server (mod_proxy_http) and wanted to ask about these lines on yours that are either not in the document or are under the /synchrony location:

RewriteEngine On
RewriteCond %{REQUEST_URI} !^/synchrony
RewriteRule ^/(.*) http://127.0.0.1:8090/$1 [P]

Please check whether editing will work if those lines are removed.
To help construct proper redirect URLs, please make sure the <confluence_install>/conf/server.xml file has the proxyName proxyPort and scheme in the connector directive. (Proxy Support)

For each application, find the normal (non-SSL) Connector directive in the Tomcat server.xml file, and add the scheme, proxyName, and proxyPort attributes inside the Connector directive, as below. Use the default values for the other attributes, including for port , unless you have a particular reason to change them, and use your own domain name for the proxyName value:
Connector port=<default>
 maxThreads=<default>
 minSpareThreads=<default>
 connectionTimeout=<default>
 enableLookups=<default>
 maxHttpHeaderSize=<default>
 protocol=<default>
 useBodyEncodingForURI=<default>
 redirectPort=<default>
 acceptCount=<default>
 disableUploadTimeout=<default>
 proxyName="<subdomain>.<domain>.com"
 proxyPort="80"
 scheme="http"/>

Thanks,

Ann

All comments

AnnWorley

Hi Nicholas,

RewriteEngine On
RewriteCond %{REQUEST_URI} !^/synchrony
RewriteRule ^/(.*) http://127.0.0.1:8090/$1 [P]

Please check whether editing will work if those lines are removed.
To help construct proper redirect URLs, please make sure the <confluence_install>/conf/server.xml file has the proxyName proxyPort and scheme in the connector directive. (Proxy Support)

For each application, find the normal (non-SSL) Connector directive in the Tomcat server.xml file, and add the scheme, proxyName, and proxyPort attributes inside the Connector directive, as below. Use the default values for the other attributes, including for port , unless you have a particular reason to change them, and use your own domain name for the proxyName value:
Connector port=<default>
 maxThreads=<default>
 minSpareThreads=<default>
 connectionTimeout=<default>
 enableLookups=<default>
 maxHttpHeaderSize=<default>
 protocol=<default>
 useBodyEncodingForURI=<default>
 redirectPort=<default>
 acceptCount=<default>
 disableUploadTimeout=<default>
 proxyName="<subdomain>.<domain>.com"
 proxyPort="80"
 scheme="http"/>

Thanks,

Ann

Nicolas Rehner

Hi Ann,

thanks for your encouragement tough i know you don't officially support this setup!

Sorry that i left out some important informations when creating my question.
I had problems to get confluence working behind a Proxy from the beginning (have to admit that i'm not an expert when it comes to administer an web server). So i read a lot of how-to's and of course your documentation and asked the atlassian community for help. I finally got it working - but ran into the problems with synchrony.

In answer to your suggestions i can tell you:

After removing the lines you recommended an error occurs when trying to access confluence

Proxy Error

The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET /login.action.

Reason: DNS lookup failure for: 127.0.0.1:8090login.action

Additionally, a 502 Bad Gateway error was encountered while trying to use an ErrorDocument to handle the request.

Those lines should make the proxy forward everything without /synchrony context to http://sub.domain.tld:8090
The recommended changes to 'server.xml' i had already made - sorry for letting this out in the original question

Are there any other hints you can give me?

Regards Nic

AnnWorley

I understand from your other post (How can I use Confluence on a subdomain) that you got a 403 forbidden error when you tried the echo test from Confluence throws The editor didn't load this time error when trying to edit a page.

Test WebSocket connections by using http://websocket.org/echo.html to perform a quick HTML5 WebSocket test against an echo server.
Click Connect and the log will reply: CONNECTED if successful.

Is this still the case? Synchrony will not work as long as a WebSocket connection cannot be established. Since you read through a lot of docs, I was wondering if you checked to make sure your browser allows WebSocket connections.

Nicolas Rehner

It wasn't exactly like this - first i tested my browsers (Safari & Firefox - both latest release) by accessing http://websocket.org/echo.html wich worked fine.

websocket.org provides html code to create your own test-site wich i used and uploaded it to my servers www-root. When i open the html file local everything works as expected, but when i try to access the file on the server (same server where confluence runs on) i get the 403.
Today i researched my server to find any "firewall" rules that could block web socket connections and couldn't find any.

Thats why my first suspicion goes back to the proxy configuration again and i putted it in the focus of my question.

Nicolas Rehner

I‘ll test it tomorrow and give you feedback.
It‘s bedtime over here.

AnnWorley

No problem - thanks for the update.

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