We received the below error in splunkd.log on our indexer server. We are using cluster env with 6 indexers. The indexers are coming up and down
After doing some researching about the error you have depicted could be related to the indexers trying to see if the others indexers/receivers are "alive" named a heartbeat function.
View solution in original post by @hliakathali_spl
Would there happen to be a firewall change either in the network and/or a firewall change on the Splunk Indexers themselves that are prohibiting the connection between them?