The third argument, reuse?, needs to be #true to get quick turnaround: 
http://docs.racket-lang.org/reference/tcp.html?q=tcp-listen#%28def._%28%28lib._racket%2Ftcp..rkt%29._tcp-listen%29%29



> On Jun 3, 2017, at 10:25 AM, Curtis Dutton <[email protected]> wrote:
> 
> Are ssl-listener's and tcp-listeners' custodian aware?
> 
> I'm having a problem with some of my test's that depend upon ssl-listener. 
> When the test fails, after the custodian that owns all of the test resources 
> is shutdown, the listener seems to remain as upon re-running the test I get a 
> 
>  tcp-listen: listen failed
>   port number: 60000
>   system error: Address already in use; errno=98
> 
> 
> 
> Thanks,
>    Curt
> 
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