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How to close port 22 / SSH on external interface

Rastan84
Level 1
Level 1

Hello. If I check my static external IP address on https://www.yougetsignal.com/tools/open-ports/

It says that port 22 is open on it. 

ISP is plugged to my Cisco 2901. 

How do I make sure the port 22 (SSH) is not open to public? 

I tried following suggestions I found on other discussions here but couldn't succeed. I'm not an expert at all here. 

Could someone please assist? 

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