Hi @keramaisa and a warm welcome from my side too!
I moved your post to the Icinga Core category, it seemed to fit there a little better.
If you are unsure where to post a topic, you can find little descriptions of them if you click the category from the front page 
I see that you have already used markdown in your addition to the post, but if you want to learn more about the formatting, there are some guidelines over here.
And, as Hendrik already said, please mark the answer that solved your problem as the “solution”
Have a wonderful day!
Feu