security issue-what could this be?

just curious as to why this would be.

I keep getting repeated attempts of people trying to connect to my server to port 119(nntp) and 137(netbios)

this is how it goes:
a single ip tries to connect to those 2 ports over and over and over. immediatly, my server picks it up as a threat and blocks them. this goes on for about 30 mins then stops. now a new ip starts doing the exact same thing. for 30 mins or so then a new one etc etc.

i dont nave nntp or netbios service running ever as im running a linux server rather windows

i just found it odd that there would be computers trying to connect to those 2 ports and only from 1 ip at a time. never 2 ips in the same time period trying to connect.

what could it be? maybe some dumb kid thinking hes cool thinks hes taking out a server trying to use windows exploits on a linux server? i dunno. was just curious to see if someone else knew something i didnt. thanks

 

 

 

 

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