Why isnt my equipment communicating with our DC

I have a CNC Mill that is networked in order to gain access to a file folder share. Out of nowhere I can not connect to this file share with the account credentials from that machine. Permissions havent changed, Account isnt locked out. I can use the same credentials at a computer and log in just fine. What is interesting though is I can not ping our DC from that machine. I can ping other pieces of equipment but not our DC. I have only removed print drivers and printers from the DC this weekend. Nothing else that would effect it to my knowledge. I am running server 2008 64bit.
Johne75Asked:
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Johne75Connect With a Mentor Author Commented:
If all else fails... Reboot. Works fine now. not sure what the heck was the root cause on that one.
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JAN PAKULAICT Infranstructure ManagerCommented:
is dc and  cnc  mill on same subnet and vlan?
looks like connectivity problem - maybe some kind of firewall - or blocked ports on router

Jan MA CCNA
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Johne75Author Commented:
yes on same subnet same lan
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JAN PAKULAICT Infranstructure ManagerCommented:
same vlan?
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Johne75Author Commented:
we do not have a vlan
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AustinComputerLabsCommented:
When you ping the DC from that machine are you pinding the IP or the DC name?

Is that machine using static IP or DHCP?
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Johne75Author Commented:
pinged both didnt resolve either. DHCP
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JAN PAKULAICT Infranstructure ManagerCommented:
can you tracert from dc to cnc .
do arp-a tocheck if you mac is right one
if not arp -d (delete cached macs) and
ipconfig /flashdns
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JAN PAKULAICT Infranstructure ManagerCommented:
can you make reservation in dhcp to reserve ip for given mac address of cnc?
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AustinComputerLabsCommented:
When you ping the DC name from the machine, does it convert it to the IP address of the DC before it starts to attempt to ping?
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Johne75Author Commented:
ok well now I am getting an echo request when I ping IP but when I ping DC name it says can not resolve. Still can not log in. Tried credentials on a computer and no problems logging in no problems accessing folder share.
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AustinComputerLabsCommented:
It appears that you have a DNS issue. If you ping the DC'c name and it cannot resolve, DNS is the issue. Run the IPCONFIG /ALL from a command prompt and look at what the machine has for its' DNS server. Is the DC in question also the DHCP server?
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JAN PAKULAICT Infranstructure ManagerCommented:
does you cnc is connected with you dns server?
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Johne75Author Commented:
yes DC is DHCP also. When I do the IPconfig it says no DHCP available...if that were true we would be having problems all day long with the everything. right?
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Johne75Author Commented:
Also I can Ping dc name just fine from another computer. Just not the mill
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AustinComputerLabsCommented:
The DHCP server leases its' addresses for a certain number of days, if DHCP just quit you may not see issues until those leases run out and new ones cannot be given.

Go to a non essential PC that is working and type IPCONFIG /RELEASE then IPCONFIG /RENEW and see if it can retrieve a new lease.
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Johne75Author Commented:
The first several attempts for the renew it said destination host unavailable. Then it finally renewed
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AustinComputerLabsCommented:
On the CNC? or the test PC?
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Johne75Author Commented:
TEST PC
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Johne75Author Commented:
Also, at the CNC i was trying to ping again. (Actually 2 CNC machines doing the same thing) at first no response try pinging again and I get a response. It seems intermittent.
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AustinComputerLabsCommented:
Sounds like DHCP and or DNS are having issues.
You can try restarting those services on the server.

Are bot PCs going through the same switch? You have have network hardware issues.
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Johne75Author Commented:
Both CNC moved to different switch (just for troubleshooting sake) Cisco switch lights blinking away. Restarted DNS and DHCP services. Still no luck. I noticed when I boot CNC there is a message that says cannot find LMHOSTS in the DOS boot screen right after it tries to initialize tcp/ip DHCP
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AustinComputerLabsCommented:
Were you ever able to get the DHCP address to renew?

Can you try a static IP?
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Johne75Author Commented:
Rebooting corrected the problem. Not sure what was broke all troubleshooting showed everything was working as it should.
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