dfs can't enable 2008 mode

Implemented a new 2012 file server and want to enable DFS.  Problem is when I go to create a namespace the 2008 mode check box is grayed out.  The domain level is set to 2008 r2 and all the domain controllers have been rebooted as well as the file server but still can't check the box.  Any ideas?
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Rich WeisslerProfessional Troublemaker^h^h^h^h^hshooterCommented:
Where do you have the DFS Namespace Service installed, and have you confirmed that the service is running?
lsysamcAuthor Commented:
IT's installed on the new 2012 R2 server and the service is running.
Rich WeisslerProfessional Troublemaker^h^h^h^h^hshooterCommented:
Okay, confirming more assumptions:
You mentioned the domain functional level (at 2008 R2)... is the forest functional level at least 2003?
Confirm the DFS namespace is domain-based, not stand alone?
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lsysamcAuthor Commented:
The domain functional level is also 2008r2.  I'm trying to create a domain based Namespace but it won't let me check the 2008 mode check box.  Right now there are no other namespaces.
Rich WeisslerProfessional Troublemaker^h^h^h^h^hshooterCommented:
If the 2008 mode check box is greyed out, it would indicate you don't meet the prerequisite.  I realize the domain functional level is 2008 R2.  Can you also confirm the forest functional level, please?  (In current versions of Powershell, you can run "(Get-ADForest).ForestMode" to output the forest functional level...)
lsysamcAuthor Commented:
Sorry, I meant the forest functional level is also 2008 r2.  I was figuring I'm missing a prerequisite but I can't seem to find what I'm missing.
Rich WeisslerProfessional Troublemaker^h^h^h^h^hshooterCommented:
Excellent.  Double check "dfsutil /pktinfo" to make certain you don't have any unexpected namespace servers.

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lsysamcAuthor Commented:
Think you may be onto something there but the result is strange.  I have setup a total of 2 DFS servers both server 2012 r2.  Both get the same grayed out checkbox.  The second DFS server is offsite though and connected via vpn tunnel.  

When I run the command from the primary DFS server I'm working at now I get 2 entrys.  1 is the offsite server.  The other is a 2008 server I was not expecting.  I just checked the roles on that server though and DFS is not installed.

When I run the command from the offsite dns server it only has 1 entry and that is itself.
lsysamcAuthor Commented:
Sorry that last line was supposed to read:

When I run the command from the offsite DFS server it only has 1 entry and that is itself.
lsysamcAuthor Commented:
Just to give an update, I did find an old dfs server but it was on a different domain here.  I removed all the root namespaces but couldn't actually remove the role from the server.  Having problems getting rid of it because it's server 2003 web edition, but thats a different problem.

Either way, even after removing all the root namespaces and manually removing them from the second domain in AD the 2008 checkbox was still grey'd out when trying to create a domain namespace.  

I tried creating the namespace using the dfsutil command line utility though and it did create the namespace in 2008 mode.  Not sure why this works but the gui won't let us choose it.
lsysamcAuthor Commented:
Well it's fixed now but I'm not sure why.  Last thing I did was add the DfsDnsConfig regdword (set to 1) and now I can set 2008 mode in the gui...  Thanks for your help though.  Definitely put me on the right path.
lsysamcAuthor Commented:
The experts post definitely led me down the right path but it wasn't the full solution.  Wanted to mark the full solution as well.
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Windows Server 2012

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