outbound denial of service attack originating from your Linode

Hi All,

Here I am going to ask some basic question, so sorry for that. Actually I don't have that much of knowledge about server. Last week I have Deployed My Web App in Linode.

And Today I get this problem "outbound denial of service attack originating from your Linode".

So In My Project what i deployed there is three things and that is

1) caddy server which is running My UI part, code written by Angular,

2) 1st part of API which is Written by GOLANG, runing in a specific port of the localhost 127.0.0.1

3) 2nd part of API which is written by GOLANG, running in another specific port of localhost 127.0.0.1

And i go through the mail what i get today morning and i check - /var/log/auth.log. but i don't get anything which should be fishy.I get Some try through ssh which is rejected but that is mine.

And here is the details what i get

Sep  3 08:16:50 localhost sshd[3426]: Server listening on 0.0.0.0 port 22.
Sep  3 08:16:50 localhost sshd[3426]: Server listening on :: port 22.
Sep  3 08:16:50 localhost systemd-logind[3437]: Watching system buttons on /dev$
Sep  3 08:16:50 localhost systemd-logind[3437]: New seat seat0.
Sep  3 08:16:50 localhost sshd[3426]: Received signal 15; terminating.
Sep  3 08:16:53 localhost sshd[3669]: Server listening on 0.0.0.0 port 22.
Sep  3 08:16:53 localhost sshd[3669]: Server listening on :: port 22.
Sep  3 08:17:01 localhost CRON[3732]: pam_unix(cron:session): session opened fo$
Sep  3 08:17:01 localhost CRON[3732]: pam_unix(cron:session): session closed fo$
Sep  3 08:17:39 localhost sshd[3736]: Accepted password for root from 122.166.1$
Sep  3 08:17:39 localhost sshd[3736]: pam_unix(sshd:session): session opened fo$
Sep  3 08:17:39 localhost systemd-logind[3437]: New session 2 of user root.
Sep  3 08:17:39 localhost systemd: pam_unix(systemd-user:session): session open$
Sep  3 08:19:59 localhost sshd[3736]: Received disconnect from 122.166.194.246 $
Sep  3 08:19:59 localhost sshd[3736]: Disconnected from 122.166.194.246 port 42$
Sep  3 08:19:59 localhost sshd[3736]: pam_unix(sshd:session): session closed fo$
Sep  3 08:19:59 localhost systemd-logind[3437]: Removed session 2.
Sep  3 08:20:01 localhost sshd[3904]: Accepted publickey for root from 122.166.$
Sep  3 08:20:01 localhost sshd[3904]: pam_unix(sshd:session): session opened fo$

So I am not getting Understand what should i do Now. If i get any help from any one I'll be Thankful to him.

And again Sorry for my English. I am not Good in that also…. :oops: :oops:

Thanks and Regards

Arnab Das