Blocking 'anonymous' FTP

Hi I am getting lots of 'anonymous' FTP scan on my server.

How do I block these scans? I am using Ipchains and fmfirewall installed in the Redhat 7.2

fewlines from the log file:
myserver.com (12-239-64-94.client.attbi.com[12.239.64.94]) - no such user 'anonymous'
myserver.com (12-239-64-94.client.attbi.com[12.239.64.94]) - no such user 'anonymous'
myserver.com (12-239-64-94.client.attbi.com[12.239.64.94]) - no such user 'anonymous'
myserver.com (12-239-64-94.client.attbi.com[12.239.64.94]) - no such user 'anonymous'
myserver.com (12-239-64-94.client.attbi.com[12.239.64.94]) - no such user 'anonymous'

 

 

 

 

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