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Server maybe? causing "suspicious activity detected" message on android (lemmy.blahaj.zone)

submitted 1 year ago* (last edited 1 year ago) by [email protected] to c/[email protected]

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So, I live with my parents, and I recently (a few months, but I've been using it a lot more the past few weeks) set up a personal home server on an intel NUC I got secondhand (which I wiped and all). We have 2 routers/access points (idk the terminology; two boxes with antennas that we can connect to, both for the same network, one of which is connected to the house internet and the other connected to the first via a 5 GHz connection iirc). My server is connected via ethernet to the secondary AP.

Anyway, my parents have been complaining about my server maybe causing issues with the internet. We've been having issues forever, but this is "new issues", and I can't actually guarantee it's not because of it so I kinda have to look into it. The symptoms are:

General connection issues (these I'm pretty sure are not any different)
On one phone, "suspicious activity detected" when connected to the network, automatically disconnecting the phone (this does seem actually new, and potentially actually caused by it)
On one laptop, refusing to connect/disconnecting automatically.

The most recent significant change to the setup was connecting my server to cloudflare/with a domain name instead of accessing raw ports with a tailscale IP. The setup is:

Docker containers for everything
Traefik reverse proxy
Cloudflare tunnels for each service (IP is dynamic and we're behind a NAT, so this was easiest)
Only non-login-required service is nginx serving a few kB of plain HTML/CSS.

Because I'm using cloudflare tunnels my external IP has, as far as I know, never been exposed and has never been in DNS.

Could any of this cause these issues, particularly the android warning? If so, is there a fix? If not, what could be causing that?

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