I am trying to setup a VPN into a business which is using Windows
domains (domain controllers, active directory etc) and access shared
folders on one of the servers. I have setup the VPN using OpenSwan
IPSec in Linux and the Windows VPN client in Windows XP.

There is a firewall on the VPN server (iptables) which is quite strict
in the INPUT and OUTPUT tables, but the FORWARD table is set to allow
everything for the vpn user.

The VPN uses certificates and connects without a problem, I can see
the shares on some of the servers (and access them), ping around etc,
but one of the shares are missing.

The share thats missing is apparantly a share that is different for
everyone, they consider it their home drive.

I assume I need to login to the domain once the VPN is created but I
am unable to do so. WHeN I connect the VPN up and try to join the
domain (using Windows XP Professional) it sits there for quite a while
(5-10mins?) before it comes back with an error. We have had a couple
of different errors, the first being 'Access Denied' and the seccond
being a timeout error.

I have tried both a standard account and the administrator account to
join the domain with and both fail.

Could you tell me what could possible be the problem where I can't see
the share  which is different for each user (I'm assuming I need to
login to the domain), and what could be stopping me from joining the
domain if it's needed.

After I get this share working, they also have an Microsoft Exchange
server they would like to access, (Points more in the direction of
logging into the domain?)