troubleshooting Question

Unable to communicate from a Macintosh to a specific Windows Server 2008 computer

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NAPlummer asked on
Apple NetworkingMac OS XMicrosoft Server OS
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Our network has two DCs with Windows Server 2008 R2. Along with other roles, one of the DCs (I'll refer to this DC as "DC1") is designated as the DHCP and File/Printer Server. Our network is primarily Win8 desktops with two Macintosh computers. We have one Macintosh computer (running OS 10.7.5) on our network that is unable to connect to DC1 in any fashion. This Macintosh is unable to get a DHCP IP address from it, unable to  connect to it via SMB, and it is also unable to ping DC1.

This Macintosh was working fine just last week. Nothing that I am aware of was done to it (e.g., software install, etc).

When we assign a static IP address to this Macintosh, it is able to access other devices on the network normally. However, it is still unable to connect to DC1 (which is where are the file sharing takes place). When we ping DC1 from this Macintosh, we get a "permission denied" message. However, when we ping other devices on the network from this  Macintosh, we do get normal ping replies back.

On DC1, we also tried doing a DHCP reservation for this specific Macintosh. However, the Macintosh simply ends up with an APIPA address. Also, on the DHCP server, there are no "deny" filter that would block this Macintosh.

The firewall is turned off on the Macintosh. And the settings to the "Virus Barrier" anti-virus software has been "relaxed." Still, this Macintosh can't get a DHCP address from DC1.

When we unplug this Macintosh from the network and plug it into a standalone Linksys router with DHCP turned on, this Macintosh does get a DHCP IP address from it.

The one other Macintosh we have a our network has no problems connecting to DC1. It's able to get a DHCP address, connect via SMB for file sharing, and ping DC1 successfully.

I am uncertain as to well the root of the problem is. Is it the Macintosh or on our domain controller?

If someone can provide me with some guidance, some action items, or share related experiences that may help us try to resolve this, that would be much appreciated.
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