Splunk indexing is not working

[manjunathaya]

Team,

Geeting below error while indexing. Please let me know how can we fix this?

11-25-2019 07:39:35.796 -0500 WARN TcpOutputProc - The TCP output processor has paused the data flow. Forwarding to host_dest=vc2crtp1428667np.fmr.com inside output group rtpindexer from host_src=vc2coma2429304n.fmr.com has been blocked
for blocked_seconds=600. This can stall the data flow towards indexing and other network outputs. Review the receiving system's health in the Splunk Monitoring Console. It is probably not accepting data.

[oscar84x]

Do you have any forwarders working successfully, so that you can compare configurations?
What does your outputs and inputs look like?
Is the Indexer(s) expecting SSL?
Could also be a network issue, is the port open on the receiving end?