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Well, if it is what it looks like and someone is trying to use get to execute the cmd.exe command to do something on your system, then you wanna setup a firewall if you don't have one so people can't find or use any open ports.
I have installed the 'standard' firewall included into the Mandrake distribution. My (newbie) question is : since the quoted attempt are continuing (I guess it's an automati procedure), can I feel a bit more secure with the firewall working? Shoud I do something else to protect my site?
If it is some automated task, i'd find out what it is just to make myself feel better. As for a firewall, ANY type of firewall is better than nothing, so yeah, i'd feel better. It depends on how secure you wanna feel as to what you setup for a firewall though.