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Unable to open debugger in IntelliJ IDEA 2017.2.7

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I am unable to open debugger in IntelliJ IDEA 2017.2.7 and getting the error message- "Unable to open debugger port(localhost:57226):java.net.ConnectException" "Connection refused:connect"

I tried changing the port number from Run/Debug Configurations,however i am still getting the same error.

debugging intellij-idea connectexception
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