everytime an error message - networking issue?

when i'm browsing my website every 3rd or 4th page occurs an error message within my browser.

"The page cannot be displayed." or so... (in german: "Die Seite kann nicht angezeigt werden.")

Is this a networking or DNS issue? That would mean it's the problem of my provider.

Or is the problem on my side? Do I have to change some configuration files??

I'm on a dedicated server so I could do it.

 

 

 

 

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