TcpOutputProc - Cooked connection to ip=timed out

[brod_geico]

Im getting below error on my heavy forwarder logs, 6 indexers are connect that HF , 4 indexers are working fine.
Only problem with 2 indexers and the same indexers are working fine for other network servers.This issue only one location.
TcpOutputProc - Cooked connection to ip=x.x.x.x.:9997 timed out

As pert of troubleshooting i have done all below things.

Added splunk:TCP ports to indexer inputs.conf and try to accept it IP|DNS|NONE but no luck.
/etc/hosts files updated the FQDN name on both sides.
Ping and trace root working fine.
All the ports are opened and FW rules are enabled.
Any thing im missing here?

[brod_geico · Accepted solution]

Thanks i have found the issue network team not enabled VPN firewall rules that is the pronlem
Data center firewalls would cause the from VPN issue for splunk that should all be allowed now

[aliakseidzianis]

It was a firewall issue for me too.

[harsmarvania57]

Check your indexers queue, whether indexers queues are running full.