ID test 7 when testing the connectivity with admincenter

Hello,

The workers of my MDCS server have stopped recently (I don't know why) and I am now trying to restart them using admincenter.

The status of my server is "unavailable" and when I test the connectivity I have the following message (an error occurs at ID 7)

7 12 avr. 2013 10:54:20 12 avr. 2013 10:54:28 134.157.52.120 134.157.52.120 MDCE_CONNECT LockDown Test ERROR com.mathworks.toolbox.distcomp.admincenter.testing.infra.util.TestFailureException: Test execution on 134.157.52.120:27352 failed. Cause: com.mathworks.toolbox.distcomp.control.ControlExceptionFactory$HostPortException: An error occurred while connecting to the mdce service on the host 134.157.52.120.

Any suggestions on what might cause this error would be appreciated.

Thanks,

Bertrand