short question: how can I prevent that somebody can see my OS and referrer when scanning me ?
I purchased blackice firewall and allready fugured out how to hide your computer name and your services you are running but still dont know how to do the thing I mentioned already AND how to block IGMP packets.
any ideas? please answer back

By default, BlackICE does not block ICMP traffic. But, certain statements can be manually added to the firewall.ini file to block certain types of ICMP messages. You can look here for more info.

As far has hiding your OS, I'm not sure that can be done but it is probably not a big security risk if your firewall is effective in every other area. Anyway, that's my view.

Something that would block your referrer like Proxomitron will work.

yes thanks proxomitron works great i can even use my own OS description and referrer
but its not longer developed
I found this two registry setting on the net and im not sure if they are disabling IGMP or not.

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters]
"EnableICMPRedirect"=dword:00000000
"IGMPLevel"=dword:00000000

Thanks for the IIS advice it works

btw i registered now