ACK scan is meant to be used for mapping firewall rule sets rather than discovering listening ports on hosts.
As we can see below all combinations gave the same result.
TCP ACK
|
Service State
|
No Firewall
|
Firewall
|
|||
-sA
|
Listening
|
State: Unfiltered
|
State: Unfiltered
|
|||
nmap
target
|
ACK
RST
|
nmap
target
|
ACK
RST
|
|||
Not Listening
|
State: Unfiltered
|
State: Unfiltered
|
||||
nmap
target
|
ACK
RST
|
nmap
target
|
ACK
RST
|
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