Hi @Asim-  Can you upload the screenshot of the  ListenSyslog processors properties?    The link below may help you to set the buffer size, [1] https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/5/html/tuning_and_optimizing_red_hat_enterprise_linux_for_oracle_9i_and_10g_databases/sect-oracle_9i_and_10g_tuning_guide-adjusting_network_settings-changing_network_kernel_settings   **NOTE: Please check with your system admin before you make any changes at the OS level. ... View more

@roshanbi Can you please confirm the way you are sending the JSON data to the Kafka topic? Are you using kafka-console-producer? Please provide producer.properties file parameters used.  ... View more

@Vikash Kumar Can you please provide the exact error message? From the problem statement, it looks like Port 8020 is closed and that is the reason why Namenode metadata service unable to establish a connection on port 8020. You may use below command to check if port 8020 is open or not. # netstat -plnt | grep :8020 tcp 0 0 172.25.x.x:8020 0.0.0.0:* LISTEN 6937/java Also, please make sure that port 8020 is not used by any other services. ... View more