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Apache Nifi: ListenHTTP - Address already in use Exception


I'm trying to run listenHTTP processor for listening to a webhook notification. 

I'm relatively new to this processor. When I initialize, I observe exception. Address already in use. 


nifi url: http://localhost:8080/nifi/    (it has a public IP but we use NATing) 


Existing configuration






Error Observed







Expert Contributor

Before starting processor ListenHHTP , please check and make sure port 8888 is not used by any other process at host where nifi service is running.

You can use netstat command to check and confirm. 


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Thank you,



Hi @ckumar 

Yes I have verified. The port is not being used. However nifi throws the error. 

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