Disconnection issue while certification exam for HDPCD Spark developer

[#1]

I have attempted the Hdpcd Spark Exam

But during the exam system got disconnected after 30 mins into the exam, it was showing an error message as " http://**************/ link might be down or moved to a different address".I have raised the issue with the proctor and from the proctor side they raised the issue.

i mailed to the certification@hortonworks.com . But they are not responding .

can any one suggest me what to do next ?