TrueNAS truenas.local: Alerts

[owegen]

Hi everyone,

the last few days I became this email from my NAS. Any Idea what I did wrong?

TrueNAS @ truenas.local

The following alert has been cleared:
* 1951 SSH login failures:
Jul 17 00:00:38 truenas 1 2021-07-17T00:00:38.388062+02:00 truenas.local sshd 23201 - - Invalid user centos from 116.98.169.131 port 50046
Jul 17 00:00:38 truenas 1 2021-07-17T00:00:38.766855+02:00 truenas.local sshd 23201 - - Failed password for invalid user centos from 116.98.169.131 port 50046 ssh2
... 1947 more ...
Jul 17 05:24:59 truenas 1 2021-07-17T05:24:59.978854+02:00 truenas.local sshd 39952 - - Invalid user from 65.49.20.67 port 47930
Jul 17 05:25:04 truenas 1 2021-07-17T05:25:04.379386+02:00 truenas.local sshd 39952 - - Connection closed by invalid user 65.49.20.67 port 47930 [preauth]

 

[sretalla]

Any Idea what I did wrong?

Do you have your TrueNAS server exposed to the Internet on port 22? if so, that would be it.

 

[rhig2000]

Is that dangerous? How can I close that port?