One workstation on sbs 2011 std. domain cannot get IP address from server

Hi all,

Here is the network setup:

SBS 2011 Std. handling DHCP,DNS for 8 win XP PC's / Router has DHCP disabled / Server connected to a unmanaged Netgear Prosafe 24 port switch / In one office I have an additional Netgear Prosafe 5 port to provide for a networked Laser Printer and two PC's

The problem is one of the PC's in the Office with the 5 port switch cannot get an IP address from the server when connected to the switch. I also swapped out switches and the problem remains

If I bypass the switch and connect directly to the PC it optains the Server addressing information and can access server Shares / Internet / Exchange.

With the cable connected to any port on the 5 port switch the Data light is flashing very fast.

Anyone have any experience with this?

Thanks Frank
flteng562Asked:
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WORKS2011Austin Tech CompanyCommented:
replace the switch what happens? move the switch to another device and see what happens.
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flteng562Author Commented:
Hi works2011,

I originally had a new Linksys 5 port switch installed. That is when the PC lost connectivity. I then purchased a Netgear Prosafe 5 port with the same result. I returned that one thinking it was bad. Installed another Netgear 5 port switch same problem.

If I bypass the switch altogether and connect the cable directly to the PC it works
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WORKS2011Austin Tech CompanyCommented:
is it set to auto negotiate with the switch, I suspect the NIC on the workstation.

What happens if you do ipconfig /flushdns on the workstation?

may uninstall the NIC drivers and reinstall or update, I would start here.

what happens if you place a laptop behind the switch?
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flteng562Author Commented:
Hi Works,

I actually installed a PCI NIC and tried it behind the switch with the same result - No connectivity.

I then removed the PCI nic and uninstalled and updated the integrated nic with the latest drivers . Same result - No connectivity

Right now i am on the problem PC with the switch bypassed. I did try a laptop but it lasted about 10 minutes then lost connectivity.
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Andrew DavisManagerCommented:
if you give the workstation a static IP, does it connect and talk on the network happily?

What is the other computer on this switch doing? Does it use DHCP and is it working fine?

Have you run rouge checker http://blogs.technet.com/b/teamdhcp/archive/2009/07/03/rogue-dhcp-server-detection.aspx
to ensure there is not a secondary DHCP causing some issue?

cheers
Andrew
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flteng562Author Commented:
Hi Andrew,

I gave the workstation a static IP and still could not connect from behind the switch.

The other PC is wireless and is working fine. I have removed the switch entirely for now to give the client time to access his e-mail. i plan on putting it back when i get onsite in the morning 8:00 AM EST

I will run the rouge check in the morning and post back.

Regards,

Frank
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Andrew DavisManagerCommented:
so there is really only 1 PC and 1 Printer behind this switch.

Does the printer work fine?

Cheers
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Andrew DavisManagerCommented:
have you tried inspecting/testing the connection from the 24 port to the 5 port.

try different port on the 24 port to feed the 5 port.
Try known good cable between 24port and 5port.

Cheers
Andrew
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flteng562Author Commented:
Hi Andrew,

With the cable coming from the wall outlet (Connected to the 24 port switch) connected to the PC directly it works fine.

I have already swapped ports on the 24 port switch and tried a different cable

When I had the printer connected to the 5 port switch along with the other two PC's neither one could print.

Regards,

Frank
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flteng562Author Commented:
Hi,

No rogue DHCP server in the network.

Just for the heck of it I went ahead and connected both PC's and the printer back up to the 2nd replacement 5 port switch  then connected the switch back into the network. Same problem - No Valid IP for either PC after rebooting them. Bypassed the switch and the desktop came back up and the laptop came back up (Wirelessly Connected).

Regards,

Frank
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Andrew DavisManagerCommented:
What model is the 5 Port?
Netgear do a 5 port http://www.netgear.com.au/business/products/switches/prosafe-plus-switches/gs105e.aspx that can be configured, that would stop it from working.

Also while you are at it. What is the model of the 24 port?

considered logging a call with Netgear?

From what you have said, even setting a static IP they still dont work, so it isnt really a DHCP problem, but a general connectivity issue.

cheers
Andrew
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flteng562Author Commented:
Hi Andrew,

Both the 24 port (JFS524v2 ) and 5 port (GS105) are Netgear Prosafe unmanaged switches.

Regards,

Frank
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Andrew DavisManagerCommented:
Hi Frank,
These should not have any issue that i am aware of.

Have you tried using a crossover cable between the switches? It shouldn't need it as it should auto x over detect.

Also the 5 port should be using port 5 to link to the 24 port.

But all these considered there appears no reason that this shouldnt work.

At this point i think you have two options.
1. Log a support call with Netgear.
2. Replace the 24Port switch. My feeling is that the 24 port is the most likely culprit. You have already changed out the 5port, you have tested ALL cables. This really only leaves the 24 port as not playing nicely with the other switch.

Cheers
Andrew
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flteng562Author Commented:
Hi Andrew,

I agree the next step would be to change out the 24 port switch. The strange thing is I have swapped to different ports on the switch to see if it was a port problem but the problem still remains.

Regards,

Frank
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Andrew DavisManagerCommented:
That doesnt rule out the 24Port switch, it just indicates that it is not an isolated (to 1 port) issue.

What you are trying to do is not anything difficult, or un-usual.  From everything above it should work. Pretty well everything else has been eliminated at all you are left with is the 24Port switch.

;)

Cheers
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flteng562Author Commented:
Hi Andrew,

I agree with your assesment the 24 port switch is the problem child. I think i will just replace it later today and post back with the results.

Regards,

Frank
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Andrew DavisManagerCommented:
Hope it goes well ;)
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flteng562Author Commented:
Hi Andrew,

I replaced the 24 port switch and it is now working with the 5 port switch uplinked to it. Very strange since nothing else showed up as far as lost connections on the other workstations.

Appreciate your help with this.

Regards,

Frank
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Andrew DavisManagerCommented:
Yeah i have seen some strange things when switches fail.

Good to hear it is resolved.
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