[Investigation] Identify and test unhappy paths.

[stevenctl]

We should identify all of the “bad” cases we can possibly take and make sure to have tests for them and we can verify sane behavior.

Examples:

Sending to a closed port

Note: I tested this and we hang for ~60-90 seconds before timing out.

Sending to an unroutable address

Sending to a unresolvable VIP

… others to be investigated