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My Linux instance got disabled by Oracle for adding port 22

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I'm having an Oracle Cloud instance with shape 'VM.Standard.E2.1.Micro' and Kali Linux as OS. The instance has been created just few days ago. Yesterday I got a mail from Oracle saying that my instance has been disabled as they detected unusual and potentially harmful activity. The following is the traffic details mentioned:

Traffic Details: Outbound Port Scanning, Brute-forcing, Web Exploitation, and/or DDoS.

It's also mentioned the activity happened through port 22.

I've actually enabled port 22 in my instance subnet by adding ingress rule and gave source as '0.0.0.0/0'. I did this so that I can access my instance through SSH. But now, Oracle disabled my instance. Can someone please let me know why this happened and is there any way to do this safely?

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