1.3.3.7 is going to be a forged IP address,, i would say is NIMDA since 1.3.3.7 is the one it attempts first.
the rest are either port scanners, worms or search robots
62.49.122.2 - mailgate.ferrodesign.co.uk , probably a smtp server, maybes its an open proxy thats being abused
67.20.204.16 co-briar-u1-c4h-16.clspco.adelphia.net some end user whos either scanning or has a worm or virus infection
209.218.69.253 - proxyscan.freenode.net someones/thing is scanning you for open proxies, check you dont have one
216.194.70.12 proxy.scanner.for.irc.mircx.com its becoming clearer whats going on, i think, are you using IRC ? on different networks, their proxyscanners are checking your ip for an open proxy when you connect. (or someone else is somehow)
IRC is a haven for crackers sometimes, so make sure your firewalls are working especially if you don't know the irc network very well , the proxy scanners are a normal part of most irc servers, and they'd likely kill or k/gline you if they detected one on your system (if its you running irc on other servers)
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