Can anyone recommend a fail2ban-like tool for a Windows OS? I've got a couple of Windows Media servers that get hammered with brute force authentication attempts. I would like to plug these authentication failures into some kind of blocking tool.
Could you provide some clarification? What are you trying to accomplish? What version of Windows? Are you trying to block bad logins to PCs, network shares, Terminal Servers, IIS-hosted pages, etc?– SkawtJun 18, 2009 at 6:20
Clarified my question.– nurikabeJun 18, 2009 at 9:45
I know of no tool that will do this "out of the box". I wrote a script to do something like this with failed OpenSSH logons on Windows, but I can't share it with you because it "belongs" to the Customer for whom I wrote it.
Having said that, it was a simple VBScript program that had an event log sink to watch for new failed logons and, if enough happened in a time window, add an IP route (using the "route" command) to route traffic to the offending IP address to a "MS Loopback Adapter" on the system.
For other types of logs, it would be a fairly trivial matter to write. Since I didn't have IPtables on Windows, the loopback adapter seemed like the next best thing. (You can't do a "route x.x.x.x mask 255.255.255.255 127.0.0.1" on Windows-- you need an adapter to route the traffic to, because the 127.0.0.1 loopback isn't a "real" interface on Windows.)
(If you want something like this written, contact me out-of-band and we can discuss the specifics of such an arrangement.)
I decided to write something to do this and I've released it under a Free license.
Check out this project - ts_block
I'm using it and thus far its terrific (Windows Server 2008 R2 RDS, system is behind a firewall but I didn't feel like using an ssl vpn gateway to the server)
I recently installed IPBan on Windows Server 2019:
It's basically a fail2ban for windows. Its goals are also mainly what we love about fail2ban:
pre-configured no-initial-fucking-around-with-scripts-or-config-files install-and-forget
wail2ban claims to be a Windows port of fail2ban
I found a tool called RdpGuard (https://rdpguard.com) that starts at $79 and appears like it might work. I haven't tested it yet, but might give it a go for my SMTP solution.
1It would probably be a good idea to have used the product, before you make the recommendation. Jul 14, 2017 at 19:35
A VM hosting company I started using includes a copy on their Windows VMs. It does the trick, and there are hundreds of firewall entries after just a few weeks.– atmarxJan 8, 2019 at 12:05
I've been using this lately and it works extremely well. I recommend it. I love how it's an easy install with a GUI interface. There are no scripts to set up and run. It's all-inclusive and allows a lot of auto-blocking beyond just RDP, such as SMTP, MySQL, MS SQL, and more if there are failed logins. Very configurable. I have no affiliation with the company that makes this program, just FYI. Feb 20, 2020 at 20:47
Ipban is free and has a one click install– jjxtraApr 19, 2021 at 2:26
You may check Win2ban which is a Fail2ban implementation for Windows systems. It is a packaging of Fail2ban, Python, Cygwin, Winlogbeat and many other related tools to make it a complete and ready-to-use solution for brute-force attack protection. A full functional free edition is available for non-commercial use.
NB! We are the developer of the solution.
It doesn't look like fail2ban runs on windows at all, as it requires iptables which is only available on Linux.
However, I would suggest that you block everything and white-list only the IPs/names you want to be able to connect to the server(s) in question, if at all possible.
Another option that I've found is QaaSWall, I haven't tested it yet, but I will be in the next day or so.