Spooky or what?, just reading this post when an e-mail came in saying one of the computers in the library wouldn't log anyone on - "No Logon Servers Available". Turned out to be a loose network cable though! Also found this used to happen because of driver issues, logged on as local admin to find "Network Drivers unable to load at Windows Start-up". Updating the Network Drivers (RealTek PCIe GBE Family Controller) from the manufacturers Website and including the new drivers into our Driver Store for deployment during computer builds has fixed this issue for us. Though it should be simple to diagnose if this is the case for you as there would be no Network status or activity lights on the Nic connection.
Last edited by Techykev; 13th March 2014 at 12:09 PM.
Client computers get what DNS servers via DHCP? (only existing AD DNS server's I hope)
Do you use VLANs anywhere? Cisco or Netgear switches perhaps? (portfast or STP issue)
We find that our laptops tend to do the same thing and is caused when it has been woken from sleep mode, or when users connect before the machine has authenticated and obtained an IP address from DHCP. This issue has become a lot more prevalent after county came in to install a new core switch.
This key helped solve this for us, rolled it out a couple of years ago to all workstations and since then never been an issue
How to disable the Media Sensing feature for TCP/IP in Windows
Hope it helps
We've had this a few times...
Some of our possible causes are:
Duplicate Hostname on the PCs / In which case rename one of them and reset the AD Computer Account(s).
Duplicate IPs (not an issue anymore with DHCP)
No network connection (Switch problems/switch down/missing Ethernet cable) - We've even seen an issue with a faulty network card and the Switch blocking the MAC address for sending obscene amounts of traffic.
Wrong/Out of date DNS settings
Sleep / Standby and regaining network connection too slow.
There are probably a lot more causes but that's what we've found.
We do use VLANs, Extreme Switches, it doesn't appear to be an STP issue.
Thank you for everyones responses, it looks like i've got the the bottom of the issue on my site.
I found an incorrect reference in DNS and in Sites and Services the NetServices section had quite a few old servers in.
A good look through these and ADSI edit turned up a few legacy issues.
If i get time i might start a new 2012 domain and migrate users over.
Thank you all again.
Another thing to note - do you have a time server in place? Computers out of sync creates all kinds of weird and wonderful problems.
The only time I generally see 'Logon servers not available' type messages is with some wireless clients, which sometimes need a few more seconds to obtain an IP address.
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