NLTEST /DCNAME Cannot find DC

I have been fighting this for over a week, and I'm stumped.
On a 2008 R2 DC that holds the PDC emulator, I get the following.

NLTEST /DCNAME:MyDomain.com
NetGetDCName Failed: Status = 2453 0x995 NERR_DCNotFound

For the most part all other tests I have tried seem to show no problems.

This DC is also a DNS and DHCP server.

I have only 2 DC's.

Below are the results of some other tests which look good, but I will include them for reference:

systeminfo | findstr Domain
OS Configuration: Primary Domain Controller
Domain: MyDomain.com

netdom query fsmo
Schema master ADServer1.MyDomain.com
Domain naming master ADServer2.MyDomain.com

PDC                         ADServer1.MyDomain.com
RID pool manager            ADServer1.MyDomain.com
Infrastructure master       ADServer2.MyDomain.com
The command completed successfully.

NLTEST /DSREGDNS
Flags: 0
Connection Status = 0 0x0 NERR_Success
The command completed successfully

nltest /dclist:MyDomain.com
Get list of DCs in domain 'MyDomain.com' from '\\ADServer2.MyDomain.com'.
ADServer2.MyDomain.com [DS] Site: Default-First-Site-Name
ADServer1.MyDomain.com [PDC] [DS] Site: Default-First-Site-Name
The command completed successfully

dsquery server -hasfsmo pdc
"CN=ADServer1,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=MyDomain,DC=com"

IPCONFIG /ALL

Windows IP Configuration

   Host Name . . . . . . . . . . . . : ADServer1.MyDomain.com
   Primary Dns Suffix . . . . . . . : MyDomain.com
   Node Type . . . . . . . . . . . . : Hybrid
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No
   DNS Suffix Search List. . . . . . : MyDomain.com

Ethernet adapter LAN 1 Slot 4 Close to mboard:

   Connection-specific DNS Suffix . :
   Description . . . . . . . . . . . : Intel(R) I350 Gigabit Network Connection #2
   Physical Address. . . . . . . . . : 00-0A-CD-24-7E-2D
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   IPv4 Address. . . . . . . . . . . : 192.168.172.1(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.172.100
   DNS Servers . . . . . . . . . . . : 192.168.172.1
                                       192.168.172.251
   NetBIOS over Tcpip. . . . . . . . : Enabled

There are 3 NIC's in total, but only 1 is enabled.

Repadmin /showrepl

Repadmin: running command /showrepl against full DC localhost

Default-First-Site-Name\ADServer1

DSA Options: IS_GC

Site Options: (none)

DSA object GUID: 59439d65-35ba-4f4e-a50d-303823810e8c

DSA invocationID: ff79b065-1e22-407a-9067-d22beab36571

==== INBOUND NEIGHBORS ======================================

DC=MyDomain,DC=com

Default-First-Site-Name\ADServer2 via RPC