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Below is a Munin Service Monitor screenshot for netstat by day which have a lot of failed connection. so I need to know is this a serious issue?

enter image description here

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Is it a serious issue? Maybe. It depends entirely on what those failed connections are/were. –  joeqwerty Jun 10 '11 at 3:32
    
It should not be downvoted - it is a valid question on how to read this brain-dead graph. –  the-wabbit Jun 10 '11 at 8:36
    
Was it downvoted? –  joeqwerty Jun 10 '11 at 10:34
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Agreed syneticon-dj, I upvoted just to make up for that idiocy. People are way too judgmental here. –  KCotreau Jun 10 '11 at 13:20
    
@joeqwerty your reputation is surely enough to have the "view vote counts" privilege. –  the-wabbit Jun 11 '11 at 19:03
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up vote 3 down vote accepted

The number of "failed" connections in your graph is rather low. For some unfathomable reason, munin developers chose a logarithmic scale for graphing, but reading the y-axis you should see that the values for "failed" are somewhere between 1*10^(-2)/s and 1*10^(-1)/s, which expands to 3 - 30 failed connections within the 5 minute collection interval. Compared to the value of your successfully "established" connections which are graphed with a maximum of 230/s (or roughly 70,000 connections within the 5-min-interval) this is a rather low value.

So probably this is not a serious issue, unless of course you are investigating a particular problem and want to rule out failed connection setups as a possible cause.

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