Logwatch, is it somebody try to knowck my server?

Hi all, i need some opinion.

I found my Logwatch :

--------------------- SSHD Begin ------------------------


Failed logins from these:
admin/password from 68.167.170.235: 2 Time(s)
admin/password from 80.97.178.114: 5 Time(s)
guest/password from 66.54.168.73: 5 Time(s)
guest/password from 68.167.170.235: 1 Time(s)
root/password from 68.167.170.235: 3 Time(s)
test/password from 66.54.168.73: 7 Time(s)
test/password from 68.167.170.235: 2 Time(s)
user/password from 68.167.170.235: 1 Time(s)

Users logging in through sshd:
root logged in from ps-work11.teamnet.net (192.104.109.171) using password: 1
Time(s)

**Unmatched Entries**
Illegal user test from 66.54.168.73
Illegal user test from 66.54.168.73
Illegal user test from 66.54.168.73
Illegal user test from 66.54.168.73
Illegal user test from 66.54.168.73
Illegal user guest from 66.54.168.73
Illegal user guest from 66.54.168.73
Illegal user test from 66.54.168.73
Illegal user guest from 66.54.168.73
Illegal user guest from 66.54.168.73
Illegal user guest from 66.54.168.73
Illegal user test from 66.54.168.73
Illegal user test from 68.167.170.235
Illegal user guest from 68.167.170.235
Illegal user user from 68.167.170.235
Illegal user test from 68.167.170.235

---------------------- SSHD End -------------------------

is it mean somebody are try to knock and harm my server?
Is it dangerous now?

 

 

 

 

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