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[cobalt-security] Did not receive identification string



I've been seeing this on my logcheck.

Unusual System Events 
=-=-=-=-=-=-=-=-=-=-= 
Dec 10 22:49:20 www sshd[31783]: Did not receive identification string from 61.175.252.139


A reverse IP lookup indicates that this ip address is:

CHINANET Zhejiang province network
Data Communication Division
China Telecom
CN

I'm running OpenSSH 3.0.2p1. Is there anything else that I should be doing to protect against whatever the ip address is trying to do?

Thanks,
Paul