Port 21 - FTP. Connect to the ftp-server to enumerate software and version. ftp 192.168.1.101 nc 192.168.1.101 21. Many ftp-servers allow anonymous users. These might be misconfigured and give too much access, and it might also be necessary for certain exploits to work. So always try to log in with anonymous:anonymous.
With port 139 open, most likely, you should see ports 135-139 open, and be able to fingerprint it as windows of some sort. Higher up ports also open on same box, may help narrow down which windows OS it is, but you can bind a service to port 139 in linux or any OS, or even port forward from a router and servers for different reasons, such as honeypots.
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Hackers exploit port scan attacks to mask their identities before launching an attack. One of their favorites: the idle scan. Editor's note: One of the steps that generally precedes a network-based attack is port scanning, in which a hacker tries to discover which services are being offered in order to launch a more specific attack.
In networks protected by firewalls and other mechanisms, access to the RPC portmapper service running on port 111 is often filtered. Therefore, determined attackers can scan high port ranges (UDP and TCP ports 32771 through 34000 on Solaris hosts) to identify RPC services that are open to direct attack.
SANS Internet Storm Center: port 111 Notes: Port numbers in computer networking represent communication endpoints. Ports are unsigned 16-bit integers (0-65535) that identify a specific process, or network service.
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