Hi there, I’m trying to temporarily block an abusive /16 subnet that is slamming a Discourse forum with requests. I tried this… [画像] How can I block an IP address? are there wildcards? Support Yes, go to Admin, Logs, Screened IPs. either star wildcard or …

Does Discourse see that you’re coming from one of the banned IPs if you go look at the user record from /admin/users? (If you’re behind a proxy like cloudflare, then Discourse may be seeing your proxy IP and not the IP of the user.)

Yep, when I connect to the VPN and then look at the last IP of my user account in Discourse it shows the IP that my VPN gave me. However, when I open an incognito browser window and try to register a new account then it doesn’t allow it: New registrations are not allowed from your IP address. So…

And to further complicate things, ufw / nftables on the host server apparently doesn’t block things as expected inside Docker: [画像] Will UFW limit Discourse too? Self-hosting This is actually a really good question and one I’m surprised nobody else has yet aske…

[画像] sb56637: So it appears that “Screened IPs” are just for registration, not for completely disallowing access to the website. I’m not sure where we document this but it’s come up a couple times recently. “Screened IPs” blocks registrations and logins from blocked IPs that match, but not e…

Thanks for confirming. So what would be the easiest method to deny requests from an IP or range of IPs? I found this, but it appears to be the opposite of what I need (whitelist rather than a blacklist), and messing around with the Nginx config inside the container feels like a total hack job: …

[画像] sb56637: So what would be the easiest method to deny requests from an IP or range of IPs? I think doing it with UFW or IPTABLES . That removes stops it before Discourse gets involved. I’m always vague terrified mucking with firewalls for fear that I’ll lock myself out, but if you target …

[画像] pfaffman: I’m always vague terrified mucking with firewalls for fear that I’ll lock myself out, but if you target just port 443 you aren’t in any danger. Exactly my fear as well. But I did enable it on the host and yet it’s still not blocking the problematic IP range. Apparently it needs…

[画像] sb56637: Apparently it needs a convoluted set of rules to make it apply the deny rules to the Docker containers. Oh. Yeah. That’s totally true. I ended up blocking access from my docker-based web servers to the docker-based postgres database (likely not one of your problems). Here’s ano…

[画像] pfaffman: Here’s another idea: Geo Blocking plugin Thanks, I was looking at that too, but it doesn’t appear to allow blocking numeric IP ranges, just entire countries?

[画像] sb56637: it doesn’t appear to allow blocking numeric IP ranges, I haven’t installed it lately, but I’m pretty sure that it does [画像] Geo Blocking plugin This can be used to completely block access to your forum for certain countries or networks, for example fraud prevention or to com…

IPアドレス範囲をブロックする方法

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tobiaseigen (Tobias Eigen) 2025 年 11 月 12 日午後 9:57 19

このトピックは解決しましたか？解決策として選択できる投稿は @rgj または @pfaffman のどちらかがありますか？この件では協力されたようですね！

トピック		返信	表示
Only allow Cloudflare IPs for Discourse server Self-hosting	15	3763	2017 年 9 月 22 日
Genuine user cannot register because of IP block Support	15	1619	2019 年 3 月 2 日
Geo Blocking plugin Plugin	44	3280	2026 年 5 月 31 日
ISP-based anti-spam countermeasures Feature	13	2599	2015 年 8 月 11 日
Discourse shows server IP/localhost as user's IP Self-hosting unsupported-install	18	2181	2022 年 7 月 12 日

IPアドレス範囲をブロックする方法

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