what does this error mean ?

Hi folks

when runing rkhunter -c ...i get this errors :

* Check: frequently used backdoors

warning, got duplicate tcp line.
Port 2001: Scalper Rootkit [ OK ]
warning, got duplicate tcp line.
Port 2006: CB Rootkit [ OK ]
warning, got duplicate tcp line.
Port 2128: MRK [ OK ]
warning, got duplicate tcp line.
warning, got duplicate tcp line.
Port 14856: Optic Kit (Tux) [ OK ]
warning, got duplicate tcp line.
warning, got duplicate tcp line.
Port 47107: T0rn Rootkit [ OK ]
warning, got duplicate tcp line.
warning, got duplicate tcp line.
Port 60922: zaRwT.KiT [ OK ]

what does this error mean ?

warning, got duplicate tcp line.

and how to avoid it ?

thnx

 

 

 

 

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