Advanced Help needed - DoS

We got this.

Some Network / Application makes a connection to our HTTPD Server without any action.

84.186.46.126 - - [29/Jul/2005:13:19:25 +0200] "-" 408 -
84.186.46.126 - - [29/Jul/2005:13:19:25 +0200] "-" 408 -
84.186.46.126 - - [29/Jul/2005:13:19:25 +0200] "-" 408 -
84.186.46.126 - - [29/Jul/2005:13:19:25 +0200] "-" 408 -

Looks like that. What todo in this case ? Any way to filter this ?
Or to trace back ?

 

 

 

 

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