Newbie here. I am setting up a webserver. The sysad requires me to
disable unused ports (services) to minimize risk. I used nmap to scan
tcp ports and then a local tool (in Mandrake) to disable unused
services. Sysad tells me some UDP ports are still open. What tool did
he use to scan them? He listed the following:
UDP ports - 23 open ports
39 [ RLP => Resource Location Protocol ]
42 [ Name => Name Server ]
43 [ whois ]
53 [ DNS => Domain Name Server ]
67 [ bootps => Bootstrap Protocol Server ]
68 [ bootpc => Bootstrap Protocol Client ]
69 [ TFTP => Trivial File Transfer Protocol ]
88 [ Kerberos 5 ]
111 [ RPC => SUN Remote Procedure Call ]
123 [ NTP => Network Time Protocol ]
143 [ imap => Internet Message Access Protocol ]
161 [ SNMP => Simple Network Management Protocol ]
162 [ SNMP trap ]
514 [ syslog ]
517 [ talk ]
520 [ router => Router routed RIPv.1, RIPv.2 ]
749 [ Kerberos Administration ]
1167 [ phone => Conference calling ]
1433 [ ms-sql-s => Microsoft SQL Server ]
1434 [ ms-sql-m => Microsoft SQL Monitor ]
1512 [ wins => Microsoft Windows Internet Name Service ]
1900 [ ssdp => Simple Service Discovery Protocol ]
2049 [ nfsd => Network File System daemon ]
How can I close these ports? Can you recommend a good reading (online)
that talks about hardening servers. Thank you.
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