How to disable ssh from RED

I checked the log summary and to my surprise found the following:

Remote user logins:

 Negotiation failed:
    no matching key exchange method found
       141.98.10.202: 1 Time
       209.141.58.169: 1 Time
       62.233.50.53: 2 Times
       92.255.85.28: 1 Time

 **Unmatched Entries**
 error: kex_exchange_identification: Connection closed by remote host : 7 Times
 error: kex_exchange_identification: banner line contains invalid characters : 1 Time

After this finding I have used this test: heise Security

The test then showed me a problem (marked red) with SSH and DNS.

I also saw under “Status” “Services” that IPS was no longer running.

After a restart everything is OK again. Also with the above test.
How can this be?

SSH Access was turned on (I had forgotten to turn it off). Now when I have SSH Access on, everything is OK too…, strange…