Debian 6: IPSec-VPN?! -> Network-Manager

After changing to Debian 6 i had to recompile the Cisco IPSec kernel module (cisco_ipsec.ko). But i ended up with:
hades:/packages/vpnclient# ./vpn_install
Cisco Systems VPN Client Version 4.8.02 (0030) Linux Installer
Copyright (C) 1998-2006 Cisco Systems, Inc. All Rights Reserved.
Making module
make -C /lib/modules/ SUBDIRS=/packages/vpnclient modules
make[1]: Entering directory `/usr/src/linux-'
CC [M] /packages/vpnclient/linuxcniapi.o
/packages/vpnclient/linuxcniapi.c:14:28: error: linux/autoconf.h: Datei oder Verzeichnis nicht gefunden
make[2]: *** [/packages/vpnclient/linuxcniapi.o] Fehler 1
make[1]: *** [_module_/packages/vpnclient] Fehler 2
make[1]: Leaving directory `/usr/src/linux-'
make: *** [default] Fehler 2
Failed to make module "cisco_ipsec.ko".
Ok... this does not work anymore.
But the network-manager has one tab labelled vpn... What about using this one?

The first try was not successful, because the "add"-button was disabled. After some googling around there was a hint to install the following package:
apt-get install network-manager-pptp-gnome
The button was enabled but only Point-to-Point-Tunneling-Protocol could be chosen. A lookup on http://packages.debian.org showed the following packages in addition:
apt-get install network-manager-openvpn-gnome
apt-get install network-manager-vpnc-gnome
After installing these packages the following vpn-types were selectable:

And with choosing vpnc the following dialog was shown

and after filling in all parameters, the vpn connection was established without any problem...


How to enable the firefox-button on linux

Have you tried firefox 4 on your linux box?
Then you expected something like this:

But on linux the menu bar is enabled as default and no firefox button is present at the window decoration...


But there is an easy way to get the firefox button enabled:
Just disable the menu bar and firefox button will appear

If you want to replace the text with a button try this posting at glandium.org.
If you are using the extension tree style tab, the button looks this way: