I can't get to the server DHCP config file (the server is owned by IT), so I don't know what that one looks like (if that is the file you are asking about). I'm not a networking guy, so I probably just don't know which file you mean.

One other weird thing I forgot to mention - when I got back, the Network Manager quit being able to talk to the DHCP server. The command line tools (ifconfig, ifup, ifdown) still work, so I disabled the manager.

The machines that weren't taken off the network have no problem resolving their hostname as a regular user.

These are the config files that I'm aware of:
/etc/sysconfig/network
Code:
NETWORKING=yes
HOSTNAME=a5303280
NTPSERVERARGS=iburst
GATEWAY=134.51.18.1
GATEWAYDEV=em1

/etc/sysconfig/network-scripts/ifcfg-em1
Code:
DEVICE=em1
TYPE=Ethernet
UUID=b5db4a96-fd99-4121-b6c6-c7ab10c8ce28
ONBOOT=yes
NM_CONTROLLED=no
BOOTPROTO=dhcp
DEFROUTE=yes
IPV4_FAILURE_FATAL=yes
IPV6INIT=no
NAME="System em1"
HWADDR=F0:1F:AF:46:33:F3
PEERDNS=yes
PEERROUTES=yes
DHCP_CLIENT_ID=a5303280
LAST_CONNECT=1474908533

[root@a5303280 dhcp]# ping a5303280
PING a5303280 (134.51.19.73) 56(84) bytes of data.
64 bytes from a5303280 (134.51.19.73): icmp_seq=1 ttl=64 time=0.017 ms
64 bytes from a5303280 (134.51.19.73): icmp_seq=2 ttl=64 time=0.022 ms
64 bytes from a5303280 (134.51.19.73): icmp_seq=3 ttl=64 time=0.021 ms
^C
--- a5303280 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2309ms
rtt min/avg/max/mdev = 0.017/0.020/0.022/0.002 ms
[root@a5303280 dhcp]# exit
a5303280_jcats1231 23: ping a5303280
ping: unknown host a5303280

Thanks for helping.