windows 7 machines suddenly can't ping/see sbs 2003 server

Hi,

There are 5 xp machines with no issue, the users tried to log into the 2 windows 7 pcs in the place and couldnt' log in.

The server is also the dns  server and they need to see that to log in.

I've tried dynamic IPs, fixed ips, nothing works,

I can't ping the windows 7 pcs from the server or other way around.

Can't see mapped drives, can't RDP to the server from those machines either.

windows xp pcs are working fine as if nothing has happened.

What could be causing this, there were no updates installed or anything.

These pcs have been working since I put them in over 2 years ago, can't understand what's happened.

Please help.
smccreery1Asked:
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arnoldCommented:
When on the windows 7 system, what is the status of the network?
netstat -rn
ipconfig /all
What is being reported for the name serer/DNS records.

The network connection may have died.
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Thomas GrassiSystems AdministratorCommented:
When you open network and sharing center what does it show?

have you tested the cables?

Are they directly plugged into the switch?

If close by switch try another cable
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smccreery1Author Commented:
It's not a cableing issue, when I connect my windows 7 laptop to a working windows xp port, it can't ping either.

all pcs are plugged into the same switch.


Everything else is fine, just two windows 7 pcs having the exact same problem at the same time so I think its a software issue.
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smccreery1Author Commented:
An observation.

I can ping the server in safe mode with networking from the two machines with the problem.
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Thomas GrassiSystems AdministratorCommented:
ok on the win 7 computers

run msconfig

on services tab hide all Microsoft services then disable all others.

on startup tab disable all

restart

On the server is this a DC ?
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smccreery1Author Commented:
I did above, hid ms services and disabled all others.

No change in normal mode.


Server is a Domain controller yes.
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Thomas GrassiSystems AdministratorCommented:
So in AD in computers and users are the two computers still listed?

run sfc /scannow

lets see if we have any corruption
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smccreery1Author Commented:
Ok I ran sfc /scannow

nothing unusual there.


I'm no further on....
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Thomas GrassiSystems AdministratorCommented:
Can you go back to a recent restore point see if that makes any difference

Go back as far as you can first
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smccreery1Author Commented:
i tried first this morning, it made no difference.


This is very strange.  The one i'm working on here has started to be able to ping the server again.

I didn't change anything, not sure what caused that.

It didn't connect straight away, after it was logged in it suddently started to work.

I think if I restart it, it will go back to the way it was.
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Thomas GrassiSystems AdministratorCommented:
Yes I agree very strange.

Just a little slow

How hard would it be to refresh the windows 7 install?
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smccreery1Author Commented:
ok.  as i was using it there it stopped being able to ping the server @ address 192.168.0.9
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smccreery1Author Commented:
on the server side in eventlogs

---------------------------------------
THe source is NETLOGON

Thesession setup from the computer OFFICE failed to authenticate.

The following error occurred
Access is denied.
-----------------------------------------
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smccreery1Author Commented:
now it's pinging the server once, getting a response, then fails the 3 remaining ping requests.

update.... now not pinging at all.
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Thomas GrassiSystems AdministratorCommented:
I would try a Windows 7 refresh install if you have another hard drive use that in that machine so you can swap back again if needed.
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Pradeep DubeyConsultantCommented:
smccreery1,

I found below link where this issue was discussed:

http://social.technet.microsoft.com/Forums/en-US/0ee86354-22d1-4940-a71c-ffe68214733f/cant-ping-between-sbs2003-and-windows-7-clients

Also sometimes DNS on SBS 2k3 blocking some ports so check at that point also see below link :
http://support.microsoft.com/kb/956189
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arnoldCommented:
What is your switch setup? Do you have 802.1x enabled?
Check your anti-virus. You have something that loads up in normal mode that is not loaded in safe mode.
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smccreery1Author Commented:
just a basic netgear switch, no issues with the xp machines connecting or pinging at all.

The windows 7 clients either can't ping the server at all or will ping once and then fail the rest of the time.

This includes my own laptop, which isn't part of this network at all.

There is one other windows 7 laptop wchich is not part of the domain here and it won't work ping it either.
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arnoldCommented:
What is the connection speed that is established on the XP/server versus the ones being reported on the netgear?
You may have a switch that is going bad. i.e. 1000MHz switch, but has issues with establishing a 1000MHz connection such that it keeps renegotiating.
Depending on how old the switch is, do you have a spare you can test?
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smccreery1Author Commented:
OK.

I reinstalled one of the windows 7 machines to the factory default.

No change, it pinged the server a few times and then failed.  It won't ping at all now.

nightmare because I've no idea what is causing this....
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Pradeep DubeyConsultantCommented:
smccreery1,

I found below link where this issue was discussed:

http://social.technet.microsoft.com/Forums/en-US/0ee86354-22d1-4940-a71c-ffe68214733f/cant-ping-between-sbs2003-and-windows-7-clients

Also sometimes DNS on SBS 2k3 blocking some ports so check at that point also see below link :
http://support.microsoft.com/kb/956189

Can you check these links once.
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Thomas GrassiSystems AdministratorCommented:
Can you change the port the computer is plugged into on the switch?

Have you thought about another switch?

What kind of router you have?

Is this windows 2003 server?
 
Does this server run dhcp ?
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smccreery1Author Commented:
sbs 2003

server is not set to run dhcp

tested a different router, no change.

tried different ports, was going to test switch but it's magically started working again for no reason..... a real puzzler.

lets see how long it lasts.
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Thomas GrassiSystems AdministratorCommented:
My guess is arp cache finally cleared somewhere.

Is that netgear a smart switch?  If not I would look into getting a smart switch helps to manage and trouble shoot a lot faster.
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smccreery1Author Commented:
not, it's just a basic 24 port netgear switch.

thanks.
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Thomas GrassiSystems AdministratorCommented:
Ok keep us posted
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smccreery1Author Commented:
ok.

customer rang me this morning to say the problem has re occurred.

same two windows 7 machines not able to connect to or ping server

Any ideas on what to do now?
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Thomas GrassiSystems AdministratorCommented:
Have you checked the firewall settings yet?

Here is how to enable ping response in Windows 7:

 Control Panel --> System and security --> Windows Firewall --> Advanced settings --> Inbound rules --> New rule --> custom rule

 in Protocol and ports: Protocol: ICMPv4
 on the same panel go to customize, choose "Specific ICMP types", check the box "echo request"
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arnoldCommented:
unless the MAC address changes on the SBS mid course, or the windows 7 systems loose access to the network themselves.
intermittent failures such as this are a ..... to diagnose.  are all systems match the maximum speed on the switch?
Do you have a discovery GPO enabling this feature on the windows 7 systems?
Try turning it off. Try unchecking the IPv6 option on the windows 7 network adapters if you do not have an IPv6 DHCP server on the network..
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smccreery1Author Commented:
i had already disabled ipv6 the last day I was there just in case.  

I unplugged everything from the switch & just plugged the server and one of the windows 7 pcs into the router.  PC can ping server fine like this.

One by one plugged all devices back into main switch, worked for a few minutes and then stopped being able to ping again.

I'm going to buy a switch tomorrow to replace the one they have, the only two things common to this problem are the switch and the server.

If I can get one quickly I'll be able to swap it out in the morning and see if that makes a difference.

If that doesn't work, it looks like my only then option is to reinstall SBS 2003, which sucks.

i'll try that discovery GPO thing, but nothing was changed re group policy, these two pcs ran happily on this network for the last 18 months.

also my own windows 7 laptop can't ping the server either, then it will ping for a while and then stop.

it's very strange.
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arnoldCommented:
Another option you could try with the new switch is:
interconnect the two switches.
Plug one windows 7 into the new switch.
Then switch some devices from the old switch to the new switch.
This way you might be able to determine which device when migrated causes an issue.

Double check all devices to make sure they are all set to auto-negotiate.
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smccreery1Author Commented:
ok.

Tried a new switch ,made no difference.

Turned out to be an intermittently faulty wireless access point.

It worked happily for 2 years and then decided to cause problems with the network.

No issues since I took it off, and to think I was going to reinstall the server....

all ok now, that's the main thing.
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Thomas GrassiSystems AdministratorCommented:
So was the WAP handing out ip addresses? Was dhcp turned on on the wap?
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smccreery1Author Commented:
no, dhcp was disabled on the wap, not sure why it started causing trouble, and why it messed with the windows 7 machines and not the others.  they don't connect via wireless either.
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Thomas GrassiSystems AdministratorCommented:
what type of wap ? brand model?

It could have been acting as a gateway device and computers were trying to route thru it.

Do you know it network config?
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smccreery1Author Commented:
draytek ap700,

i'm going to test it tomorrow on my own network to see what's wrong with it.

i haven't checked the settings since it was set up.
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Thomas GrassiSystems AdministratorCommented:
ok keep us posted
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smccreery1Author Commented:
disconnected wireless access point from network, problem solved.
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