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Hello Jack,

Am 19.02.2020 um 19:09 schrieb Jack Woehr <jwoehr@xxxxxxxxxxxxxxxxxxxxxxxx>:

Unfortunately, I don't know how to suppress this message in IBM i.
The way to "suppress" it is to have a competent network security group analyze your exposure and mitigate that.

Ssh is an encrypted protocol. I don't know of any firewall solution which can look into an encrypted ssh session to see what it's up to. What kind of magic do you expect the competent network security group to do? :-)

Some "advanced" firewalls can do SSL cracking by in-place exchange of certificates with one signed by an internal CA. Which means that this CA has to be enrolled on all client devices wanting to communicate over the internet per SSL. And, this technique is fundamentally incompatible with SSL Certificate Pinning. But that's a completely different thing to Ssh.

My suggestion would be to not expose IBM i to the internet at all. And if that's really necessary *and* ssh (aka Sftp) must be reached from outside for one reason or another, it can be that Sftp-Peers utilize dynamic addresses, so it's not possible to predict where legit connections come from. Yes, it would be possible to exclude "bad" country's IP allocations. Been there, done that. I'd never open that particular Box of Pandora again.

:wq! PoC (Linux/Network/Firewall-Guy)

PGP-Key: DDD3 4ABF 6413 38DE - https://www.pocnet.net/poc-key.asc



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