RTC Extensions Workshop – How to fix SSL protocol errors preventing connection to Jetty Debug server

Since some time now I started to run into a blocking issue with the Extensions workshop. I was not able to find a solution so far. Today a colleague saw the same and asked for help. Here what I found.

Problem: the browser prevents connecting to the Jetty server

When launching the Jetty Debug server, everything seems to be fine. You can even connect with an Eclipse client to the server. However, if you try to follow the description in the Extensions Workshop and you try to connect with a browser to https://localhost:7443/jazz/admin you see a screen like the one below.

SSL Error_1

In Chrome the error claims

This site can’t provide a secure connection localhost sent an invalid response.

Try running Windows Network Diagnostics.


Firefox is even more alarming and says

Secure Connection Failed

An error occurred during a connection to localhost:7443. Peer reports it experienced an internal error. Error code: SSL_ERROR_INTERNAL_ERROR_ALERT

The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.

Please contact the website owners to inform them of this problem.

Learn more…

Report errors like this to help Mozilla identify and block malicious sites

Edge complains

Can’t connect securely to this page

This might be because the site uses outdated or unsafe TLS security settings. If this keeps happening, try contacting the website’s owner.

Try this:

Go back to the last page

It looks like the usual SSL issue with the standard certificate, but it actually is not. It does not allow you to proceed and add an exception to connect to the web site.

You are basically stuck.

I had the same issue yesterday with 6.0.5 and 6.0.6 and I knew it was working very recently – when I moved to my new laptop. I searched the internet and was not really sure about a solution still. The answers pointed at version issues and certification mismatches. So I decided to switch the Eclipse environment to a current JDK and that solved the problem. I have tried it with RTC 6.0.5 and 6.0.6 but I am pretty sure it would work with other versions as well.

Please note that the Extensions workshop suggests to use the same JDK the Server uses. I think since Browsers have recently increased their security measures, this is no longer true.


Here how to fix the problem.

  • Download and install a recent Java JDK/JRE that is compatible with the version of the RTC SDK you are working with.
    • 6.0.6 is compatible with Java 1.8
    • I use a JDK because there are other development tools that require a JDK
  • Open the Eclipse server development workspace
  • Open Window>preferences
  • Type JRE and navigate to Java>Installed JREs
    • Add the new JDK/JRE
    • Select the JDK/JRE as active click Apply and CloseNewJDK
    • Navigate to Java>Installed JREs>Execution Environments
    • Select the Execution Environment with the matching version
    • Select the new JDK/JRE as active click Apply and CloseExecEnvironment
  • Launch the Jetty debug serverLaunch

Now try to login to https://localhost:7443/jazz/admin again. You still get an error, however the browser provides the Advanced link to continue connection to the site.

SSL Error_2

The different browsers display it different, but the concept is the same for all of them.


Recent increases of browser security checks and invalidation of certificates requires to update to recent versions of the Java JDK/JRE to be used with the Extensions workshop. As always I hope that this helps people out there.

Chrome Does Not Work With RTC Debug Server on Jetty

Recently I tried to use Chrome with a RTC debug Server running on Jetty. I was unable to do so. Why does this happen and is there a work around?

Affected Versions

This problem only occurs when using the RTC SDK for RTC versions prior to RTC 6.x. The RTC 6.0 and later SDK’s are not affected as they enable TLS.

* Update * see Unable to Connect to the Jetty Server Using Current Browsers Due to SSL Error Extending RTC Versions Lower Than 6.x for newest developments and potential workarounds. This work around does no longer work for the newest versions of Chrome.


When I tried to navigate to the public URI https://localhost:7443/jazz/ of my debug server I got a message

This webpage is not available


See the screenshot below:

This webpage is not available ERR_SSL_VERSION_OR_CIPHER_MISMATCH
This webpage is not available ERR_SSL_VERSION_OR_CIPHER_MISMATCH

I created Defect 354890 to get it addressed.

Root Cause And Work Around

As described in the defect above, it appears that Jetty uses SSL as a default protocol to talk to the browser. Chrome version 4 has disabled SSL due to defects in the older SSL implementations. This can basically also happen in other browsers soon.

To fix this, Jetty would have to be set to TLS as default. Although this seems to be the documented default for newer versions, the SDK does not seem to have that setting. I searched around and was also not able to find a way to force it.

It would be good if there was a way to set e.g. a System Property in the server launch configuration.

This work around I found on the net worked for me for Chrome v40:

  • Open the URL chrome://flags
  • Look for “Minimum SSL/TLS version supported.
  • Change from Default and choose SSLv3
  • Click on the “Relaunch now” button

Open your public URI https://localhost:7443/jazz/ again. You will be redirected to a page “Your connection is not private“. Click on the “Advanced” link. Finally click on “Proceed to (unsafe)“.


Chromium has the same problem. And the same fix.

Give Me A REST

Recently I worked with OSLC/REST and discovered a nice REST client that I find really useful. I thought I would share it with you here.

If you have found tools that help you with this and want to share, please comment to the post. Please use English, describe the tool, what it does and why it is useful. If possible provide the URL in the comment as well. This will help me distinguishing the valuable information from occasional spam that slips through.

* Update * See Postman as another alternative. Links can be found below.

I have actually not done that much work with OSLC/REST in the past. I worked with the Java API’s most of the time. I have however done the Open Services for Lifecycle Collaboration Workshop in the past and also helped submitting it in classes.

The workshop suggests to use Firefox and one of the REST Client Addons available. I did exactly that and it was a pain in the, err.., neck. Why? The whole URL was maintained in one line and that, every time I changed the focus, snapped back to the position in the front. I found myself frantically scrolling back and forth trying to find the last edit location. In general the display did not give me a good way to understand what the request did and if there were issues with it. Not pretty. I tried out alternatives, but I couldn’t find anything satisfying.

I decided to try a different browser – despite the fact that I really like Firefox.

I looked into Chrome, which I recently started to use for JavaScript based Attribute Customization as described in this Wiki page and the Process Enactment Workshop (Lab 5). It suits me way better for JavaScript debugging, as I find it a lot easier to find the script, compared to Firefox Firebug.

The Nugget – Advanced REST Client

I discovered the Advanced REST client. And I it’s a nugget. A really big one actually, I think. You can simply download and install it in Chrome and have it in your Apps tile in the bookmarks bar.

AppBookMarksThis makes it easy to reach and does not take away a lot of real estate.

Now what are the things that distinguish this from other REST tools I have seen so far?

URL Management

The URL management is really nice as it basically allows you to work in two modes.

There is the traditional mode where you have the whole URL in the URL field. This is most efficient to use if one has a complete URL available and wants to copy/paste it.

Traditional URL ManagementThe first real great difference however is the small triangle in front of the URL field. It allows you to automatically decompose the URL into its interesting parts with respect to REST and also to easily manage the query parameters.

Note, I found some URL’s where this does not work as expected for the decomposition. You can still use the feature, but folding/unfolding needs some manual work during unfolding. I hope this gets corrected soon.

Decomposed URLThis is very useful, as it allows to focus on the parts that are really interesting and removes the need to parse the URL visually. It is really easy to edit, add and remove query parameters to create the needed content.

There are also several ways to help with encoding and decoding the request data.

The same is available for the request headers.

Request HeaderIt is possible to use the Raw mode to copy and paste complete headers and it is possible to switch to a Form view like above that works similar to the query parameter section.

 Manage Projects And Save Requests

The second really useful feature is the ability to manage requests and to save them in projects. This allows to store requests that work or are under construction for later use.

Manage And Save RequestsWhile I was looking into OSLC, I had issues with my request several times and I found myself maintaining my URL’s in a text file while I was exploring. Being able to save the request makes it a lot easier and it is no longer necessary to switch between applications.

If something works, it can be kept and changed to work towards the final goal.

You can have multiple projects to manage the request, for example for different projects.

Other REST Tools

I found another REST tool that has similar capabilities.

Postman is available as application (online usage) and as Packaged App. It provides similar capabilities, except I miss the encoding/decoding option. The advantage of Postman is that it keeps a request history. This is easier to use compared to saving the change every time.


The Advanced REST client together with Chrome made my life a lot easier and I can only recommend to use it. If you do, give it a big thumbs up and donate to help supporting it.

As always I hope this is useful to the Rational Team Concert and CLM users out there.