"Error using connector.​ensureServ​iceOn" when clicking "Get Add-Ons"

Asking this question in case anyone else has faced the same problem / has found a solution.

Release: R2015b 64 bit, Windows.

When clicking on "Get Add-Ons", this error message pops up on the command window:

Error using connector.ensureServiceOn
Error starting MATLAB Connector. Please check that port 31515 is available. 
com.mathworks.jmi.MatlabException: Error starting MATLAB Connector. Please check that port 31515 is available.
  at com.mathworks.jmi.NativeMatlab.SendMatlabMessage(Native Method)
  at com.mathworks.jmi.NativeMatlab.sendMatlabMessage(NativeMatlab.java:266)
  at com.mathworks.jmi.MatlabLooper.sendMatlabMessage(MatlabLooper.java:120)
  at com.mathworks.jmi.Matlab.mtFevalConsoleOutput(Matlab.java:1778)
  at com.mathworks.jmi.MatlabWorker.feval(MatlabWorker.java:195)
  at com.mathworks.jmi.MatlabWorker.feval(MatlabWorker.java:172)
  at com.mathworks.addons.ConnectorFactory$1.runOnMatlabThread(ConnectorFactory.java:37)
  at com.mathworks.jmi.MatlabWorker$2.run(MatlabWorker.java:79)
  at com.mathworks.jmi.NativeMatlab.dispatchMTRequests(NativeMatlab.java:475)

What I've tried:

• Allowed R2015b.exe in the Firewall for inbound and outbound connections.
• Allowed TCP port 31515 in the Firewall for inbound and outbound connections.

Still no luck.

Answer 1

[Dave Behera]

Hi,

The issue is related to the network configuration. One possible workaround is forcing JVM to use IPv4 over IPv6 by setting the java.net.preferIPv4Stack config. The following discussion page provides some relevant discussion:

http://stackoverflow.com/questions/8216713/java-net-socketexception-invalid-argument-connect%3E

To work around this issue create a new System Variable named JAVA_TOOL_OPTION, with the value -Djava.net.preferIPv4Stack=true

[Vikram Bajaj]

This didn't work for me :( Any other solution?

[Dominik Melcher]

I solved the problem by deleting the MATLAB_JAVA path in my system variables.

[naveen kumar]

I deleted the MATLAB_JAVA variable.Yet no luck.

Answer 2

[AFTAB ALAM ANSARI]

Don't go for rubbish like "it's because of JAVA". This happens when MATLAB is blocked by some firewall that is blocking MATLAB from connecting to Internet. MATLAB uses Internet during Stimulation. Just exclude it from firewall and there you go. There will be no error.

[Eric Zhai]

This answer really helps me. After I exclude MATLAB from the firewall in the computer, the error never come up.

[Johanna Nandar]

Hi, how you do this

Answer 3

[Hicham Belh]

i got this error by click on getaddon:

Version: Matlab 2018a

error:

Error using connector.internal.doEnsureServiceOn

Error in Connector: Did not start the server. Desired port was: 31515. Last error

was: Server did not respond to initial request: 127.0.0.1:31714

Error in connector.ensureServiceOn

Warning: Issue starting Connector. Please check that port 31415 is available. Did not

start the server. Desired port was: 31515. Last error was: Server did not respond to

initial request: 127.0.0.1:31714

thx for any help

Lega

[MUTHUKUMARASAMY V]

I too get the same error when opening model configuration parameters