Am I being scanned ?

[Balbir Thomas <thomas.1037@osu.edu>]

Hi,
My tcplogd reports are starting to look like this :

May 22 18:09:06 mandelbrot tcplogd: port 1884 connection attempt from
+outpost.zedz.net [194.109.206.210]
May 22 18:09:06 mandelbrot tcplogd: port 1885 connection attempt from
+outpost.zedz.net [194.109.206.210]
May 22 18:09:07 mandelbrot tcplogd: port 1886 connection attempt from
+outpost.zedz.net [194.109.206.210]
May 22 18:09:08 mandelbrot tcplogd: port 1887 connection attempt from
+outpost.zedz.net [194.109.206.210]
May 22 18:09:09 mandelbrot tcplogd: port 1888 connection attempt from
+outpost.zedz.net [194.109.206.210]
May 22 18:09:09 mandelbrot tcplogd: port 1889 connection attempt from
+outpost.zedz.net [194.109.206.210]

This goes on and on . Does this mean someone is trying to port scan my pc. If so what can I do to detect/prevent breakin and restrain him/her ? Any pointer to security for debian newbies ??
thanking you 
b thomas