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…