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Server suspended due to excessive conntrack sessions
Hello fellow LETers,
So, I had my server suspended because "it had too many conntrack sessions by our log reports."
I had no idea what conntrack is, until this happened. My question goes mainly to people who have knowledge of this: What can I do to prevent this from happening again?
I've set up a few iptables rules, and I'm thinking of baning most IPs I know I won't use (such as High-risk countries etc), but I don't know how effective it'll be.
Edit: The server is a Nextcloud instance which handles backups of my personal files, and for 3-4 other people as well (all of whom use the NextCloud desktop client). It is also monitored by UptimeRobot and SeFlow's WebSite Protect at 5 minute intervals both.