What does the ICMP 'Port Unreachable' error mean
Issue
When attempting to send data across a network connection, the network connection may fail with a Destination unreachable (Port unreachable) error. This can happen at any time -
- during connection startup
- while connection is established and partial data exchange has been done
- during connection tear down.
This can happen with either TCP or UDP connections.
Environment
Red Hat Enterprise Linux (any version)
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