I have configured firewall and allow only port 443 and deny all tcp ports for destination, but when i am scanning from port scanner it shows several tcp ports are enabled.. need your seuggestion and help on it.. how to block these tcp ports..
Still don't know the ports that were supposedly open.
Though if that is the ACL you have bound to the "outside" interface on the ASA then it should be blocking the connections through the ASA for everything else other than the TCP/443 for a single destination IP address.
Then there is naturally the ASAs own services and ports on which its listening on.
You can check that with the following command
show asp table socket
Most likely the ports that are open on the ASA are the ones used for management purposes perhaps
Those set with the following commands
You also have the option to create an ACL that blocks all traffic to the ASA "outside" interface IP address. You can then attach it with "access-group" command
access-group in interface outside control-plane
This would limit the "To the Box" traffic. Though the above mentioned management commands "telnet", "ssh" and "http" would still override this ACL.
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...