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I tried to Join the windows domain in the system properties but it does not work. I am sure I am missing something I am just no sure what. When I try, it tells me that the an active directory domain controller for the domain listed can not be contacted. <br />
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A dns issue?
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I tried to Join the windows domain in the system properties but it does not work. I am sure I am missing something I am just no sure what. When I try, it tells me that the an active directory domain controller for the domain listed can not be contacted.

A dns issue?

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Hi <br />
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I'd focus on DNS , from a remote office . Can you ping active directory DNS name ? e.g Company.local ?
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Hi

I'd focus on DNS , from a remote office . Can you ping active directory DNS name ? e.g Company.local ?

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Make sure your remote PCs can ping your domain name . if that is successful , my next question is about your access lists . do you allow all protocols across your VPN tunnels ? 
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Make sure your remote PCs can ping your domain name . if that is successful , my next question is about your access lists . do you allow all protocols across your VPN tunnels ?

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It looks like my whole post did not go through. It was a DNS issue. 
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It looks like my whole post did not go through. It was a DNS issue.

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I just configure S2S VPNs from three remote offices to the Home Office using Cisco ASA 5505's. I have tested the VPNs and I can access files on the home network by using the UNC path from a PC in the remote office. The computers and servers are all Microsoft.<br />
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My question is, can the computers in the remote offices be joined directly to the home office network and if so how do I accomplish this?
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I just configure S2S VPNs from three remote offices to the Home Office using Cisco ASA 5505's. I have tested the VPNs and I can access files on the home network by using the UNC path from a PC in the remote office. The computers and servers are all Microsoft.

My question is, can the computers in the remote offices be joined directly to the home office network and if so how do I accomplish this?

Can Computers in a remote office join the home office  domain through a Site-To-Site IPes vPN tunnel?

A virtual private network (VPN) is a network that uses a public telecommunication infrastructure, such as the Internet, to provide remote offices or travelling users access to a central organizational network securely. VPNs encapsulate data transfers using secure cryptographic methods and other security mechanisms to ensure that only authorized users can access the network and that the data cannot be intercepted.

Cisco PIX is a dedicated hardware firewall appliance; the Cisco Adaptive Security Appliance (ASA) is a firewall and anti-malware security appliance that provides unified threat management and protection the PIX does not. Other Cisco devices and systems include routers, switches, storage networking, wireless and the software and hardware for PIX Firewall Manager (PFM), PIX Device Manager (PDM) and Adaptive Security Device Manager (ASDM).