Request to heat-api times out randomly with error "Unable to establish connection to"

Solution Verified - Updated -

Issue

  • Connections to Heat APIs are timing out randomly with below error message. This usually happens when too many requests are sent to heat-api.
Unable to establish connection to http://heat-api-ip:8004/v1/9cfdcca495354d738ea9bd6220c413fd/stacks?

Environment

  • Red Hat Enterprise Linux OpenStack Platform 6.0 (RHOS)

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