IIRC you can close 20 and 21 (FTP), 23 (Telnet), 43 (whois), 123 (NTP).
This is of course unless you use any of these services. FTP can be
moved to a non standard port and will decrease attacks by 99%. 953,
993, and 995 are for secure mail transport.
On 05/31/2011 09:21 AM, sysad...@tricubemedia.com wrote:
Hi Guys, trying to tighten up the qmail server more:
Can I close any of these ports: not sure waht they may be needed for:
tcp dpt:20
tcp dpt:21
tcp dpt:23
tcp dpt:43
udp dpt:123
tcp dpt:953
udp dpt:953
tcp dpt:993
tcp dpt:995
Thanks all
madmac
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