http://www.pcwelt.de/know-how/extras/103039/
How to correct the problem
It is not advisable to keep this defective default configuration. However, the previous environment cannot be restored: The configuration for the firewall was changed, which does not allow the setting of active or inactive conditions or exceptions for each network adapter anymore. Now this only works for network areas.
Choose "Windows Firewall" in the in the Windows Control Panel and the there the tab "Exceptions". Select "File and Print Services" and click on "Edit". Now you can see four ports which are used by the file and print sharing service.
To lock the service to the outside and keep it open for the internal LAN, you have to individually select and change its area with the respective button. Our reader Yves Jerschov notified us of another bug: The value for the area set by default "Only for own network (Subnet)" only works, if the Internet Connection Sharing is activated. If this is not the case, your shared data are visible worldwide. This error can be corrected by choosing "User defined List" and entering the IP addresses that are supposed to have access - the IP addresses of your LAN. A whole range of an IP area can be entered as "192.168.x.0/255.255.255.0", if the respective addresses start with 192.168.x.
After these measures, you can be sure to be as safe as you were with SP1. Great, don't you think?
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