Server Crash Too many connections to PureFTP

hi,
some china guys are bobarding a server i have.
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Jan 2 20:30:46 servername pure-ftpd: (?@?) [WARNING] Too many connections (8) from this IP: [211.72.151.162]
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Is there any way to tweak pureftp better and blick this attacks?
The server crash ever few hours.

Thanks

 

 

 

 

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