Annoying specific incoming connections: should I avoid or accept them ?

Hello,

Since several months Eset keeps raising an alarm about incoming connections.
What I cannot understand is why I can refuse them manually without having my Internet connection broken, and why the connection gets broken if I create a rule (the connection will works again as soon as the rule is deleted).

Those incoming connections always come from the same addresses: ns1.numericable.net and ns2.numericable.net (89.2.0.1 and 89.2.0.2 respectively) from distant port 53. Local port always change.

Should I always accept those connections or are they attacks to avoid ?

Thanks !

 

is that your dns server? Allow if yes

 

Yes it is.
Note that I have just upgraded to the latest version 4.2.67.10 (I had 4.0.xxxx).
So far I didn't have any alarm but I'll eventually post should this continue.
Thanks for your reply.