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Special Forums Cybersecurity Continual knocking on port 443 from foreign IP address Post 302893837 by randomxs on Friday 21st of March 2014 10:10:21 AM
Old 03-21-2014
Continual knocking on port 443 from foreign IP address

Hello,

I have a server in our DMZ that only has ports 80 and 443 open to the public networks. It runs webmail for our 10K employees' accounts. It's not necessary for our employees to access the server from anywhere except North America so I have blocked access from most of the world due to occasional phished and compromised accounts.

I LOG then DROP most CIDR blocks from RIPE, APNIC, LACNIC and AFRINIC using iptables on the server. I noticed that once I enabled iptables several IP addresses continually knock on port 443. This has gone on for months and seems to be an automated process from a network located in Mexico City.

My question is this:

Why would someone continually try to access the https port for months on end 100s of times an hour when clearly they must see they are being denied access to the server?

The actual IP address appears to be a DSL connection and must be a compromised computer. Over the past several months since I turned on iptables this has continued.

I'm really curious as to the purpose of this. Does anyone have any ideas?

Thanks in advance
 

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iptables-apply(8)					      System Manager's Manual						 iptables-apply(8)

NAME
iptables-apply - a safer way to update iptables remotely SYNOPSIS
iptables-apply [-hV] [-t timeout] ruleset-file DESCRIPTION
iptables-apply will try to apply a new ruleset (as output by iptables-save/read by iptables-restore) to iptables, then prompt the user whether the changes are okay. If the new ruleset cut the existing connection, the user will not be able to answer affirmatively. In this case, the script rolls back to the previous ruleset after the timeout expired. The timeout can be set with -t. When called as ip6tables-apply, the script will use ip6tables-save/-restore instead. OPTIONS
-t seconds, --timeout seconds Sets the timeout after which the script will roll back to the previous ruleset. -h, --help Display usage information. -V, --version Display version information. SEE ALSO
iptables-restore(8), iptables-save(8), iptables(8). LEGALESE
iptables-apply is copyright by Martin F. Krafft. This manual page was written by Martin F. Krafft <madduck@madduck.net> Permission is granted to copy, distribute and/or modify this document under the terms of the Artistic License 2.0. 2006-06-04 iptables-apply(8)
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