...to connection attemps
Answers:
Use a firewall.
On my Windows XP Home SP2 computer i use:
Comodo:
http://www.personalfirewall.comodo.com/...
Even if you do not especially necessitate a router, copious inexpensive routers include both NAT and SPI firewalls. You do not enjoy to own more than one computer to use them.
Software firewalls still own a place. They are more efficient on internal threats.
Set your firewall to stealth mode.