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If you use Fail2ban only for SFTP you could give a try to SFTPGo, it has a builtin defender that should not have this issue. SFTPGo doesn't allow shell access, so if you need it, just ignore my comment
you could try.. denyHosts
You want to set up a black hole route and have some sort of analyzer send routes to those hosts. Palo alto has a product but you can also build your own with some open source stuff such as [this black hole routing site]("github - ncsa/bhr-site: Blackhole Router Site" https://github.com/ncsa/bhr-site). Y