Win7 device can access local network but not internet

HI,

Background
win7 pro
ethernet nic and wifi nic
system receives dhcp addresses, can access local network but not internet.

not a dns issue. can ping local address by IP and device name.

cannot ping outside of router by ip ad address or device name

was fine yesterday, nothing has changed in the network.

other devices on the network are working fine.

any thoughts?

TIA
Gareth
Gareth McKeeCEO/OwnerAsked:
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Saad MardiniIT Support SpecialistCommented:
may be there is a duplicate IP address someone has added a device to the network , you can install wire shark and see what happens
Andy BartkiewiczNetwork AnalystCommented:
If you do an ipconfig does it show a gateway of 0.0.0.0?
Gareth McKeeCEO/OwnerAuthor Commented:
Thanks Saad,

no additional devices.
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Gareth McKeeCEO/OwnerAuthor Commented:
gateway is correct.
Owen RubinConsultantCommented:
To state some of the more early tests:
  1. Have you rebooted the machine since this started?
  2. Is it possible the TCP/IP stack is messed up? (netsh int ip reset reset.log  then netsh winsock reset catalog)
  3. Did a Proxy get added to the browser by any chance?
  4. Have you tried other Internet applications to see if this is a browser issue or a whole computer issue? Maybe Skype of a different browser?  

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Gareth McKeeCEO/OwnerAuthor Commented:
1.Have you rebooted the machine since this started? yes
2.Is it possible the TCP/IP stack is messed up? (netsh int ip reset reset.log  then netsh winsock reset catalog) int reset done, I will reset winsock
3.Did a Proxy get added to the browser by any chance? have checked, no
4.Have you tried other Internet applications to see if this is a browser issue or a whole computer issue? Maybe Skype of a different browser?  whole device issue, no browser, cannot even ping 8.8.8.8
Gareth McKeeCEO/OwnerAuthor Commented:
also.

have entered IP manually, this made no change.

continual ping from server to device drops around 1 in 6 requests.
Owen RubinConsultantCommented:
ethernet nic and wifi nic

Are you using both the Wifi and the Wired at the same time? Are they both getting the same IP address? Could be a problem even if different (which also might explain dropped packets. )
I have not tried using two networks at the same time that was not a router,or at least talking to two different networks  so I am wondering if they are interfering with each other.  (grasping at straws looking for ideas.)

Try disabling one interface and doing your tests again. Then try the other one. I am curious if the problem is on both network interfaces as well.
Owen RubinConsultantCommented:
In another strange grasp, have you tried using a different IP address? If you know of some unused ones in the current subnet, you could try a different static IP as a test. Just possibly some old firewall rule attached to the current IP and you got that IP through DHCP.  Not likely, but it could be possible.
Gareth McKeeCEO/OwnerAuthor Commented:
hi Owen,

wifi is disabled, was previously enabled ad eth nic was having an issue.

reinstalled eth nic, now ok.

they were on different IPs.

Different IP, I will give it a go.
Owen RubinConsultantCommented:
Gareth, just shotgunning potential problems. We might stumble over one!  :-) Thanks for trying them out.
Gareth McKeeCEO/OwnerAuthor Commented:
change to static IP outside of DHCP scope, still not working.
Gareth McKeeCEO/OwnerAuthor Commented:
I have also now put a static on the wifi.

disabled eth nic, enabled wifi.

still not working
Gareth McKeeCEO/OwnerAuthor Commented:
reset winsock catalogue.

still not working.
Owen RubinConsultantCommented:
ARGGGHHHH!  Ok, back to testing and research. Sorry.
Gareth McKeeCEO/OwnerAuthor Commented:
after another restart, I looked at static IP, the gateway had been removed??? was configured properly a few minutes ago.

now works.

have reverted to DHCP.

it is now working.

thoughts?
masnrockCommented:
Did something happen or change with your NIC driver? That's one of the few scenarios that come to mind....
Owen RubinConsultantCommented:
I wonder if it switched which network it is using now as default?
Gareth McKeeCEO/OwnerAuthor Commented:
no driver changes.

on the wifi by default.
pgm554Commented:
Have you tried a different browser?
You may have malware issues.
nobusCommented:
try running sfc /scannow  http://www.sevenforums.com/tutorials/1538-sfc-scannow-command-system-file-checker.html         SFC
and update all drivers
Owen RubinConsultantCommented:
Pgm, scan up the thread a bit. I asked a related question and he said it effects the entire computer. So we can assume that means the problem is not browser based,.
sarabandeCommented:
after another restart, I looked at static IP, the gateway had been removed??? was configured properly a few minutes ago.

can you reproduce this behavior?

if your default internet connection is by wifi how did you make sure that your browser doesn't try to use the ethernet connection instead? if there is any computer connected to the LAN which shares its internet connection, you may get conflicts when the credentials are not sufficient to log-in at this computer. if you want to make sure that only wifi is used for internet at your notebook, you should disable Internet for your LAN adapter.

Sara
Owen RubinConsultantCommented:
Hi Sara. If you scan up in the discussion, you will see I asked that earlier as well. It sounded to me like he had both connected and both on the same LAN, which I worried might cause both interfaces to try and handle the same traffic and cause problems.

Like you I assumed a possible conflict. So I set up a Windows 7 and Windows 10 machines to test that.  It seems that when a LAN connection was found, no traffic flowed across the WiFi network. If I unplugged the wired connection, the system fell over to the WiFi and got a new IP address (DHCP). When I reconnected the wire, it switched back. I never configured anything like that, so I’m guessing this is standard behavior for Windows. I note my Macs work exactly the same way, although there I can change the order of precedence. I assume that Windows can do the same thing.  

I tried it again giving both WiFi and wired the same static IP address and also had no problems.

So unless that machine has a strange network config issue, I do not believe this to be the problem. Although a bad WiFi connection might cause a bunch of switching back and forth causing issues.
Gareth McKeeCEO/OwnerAuthor Commented:
as I said, it is now working.

I believe the netsh winsock reset catalog fixed it, as this was the last thing I did before another engineer took a quick look and noticed the GW was missing.

the GW was set correctly earlier.

would netsh winsock reset catalog remove a static GW?
masnrockCommented:
would netsh winsock reset catalog remove a static GW?
It's not supposed to mess with that at all. Resetting the TCP/IP stack would. And even then, it would delete ALL of the static IP settings, not just the gateway.
Gareth McKeeCEO/OwnerAuthor Commented:
believe it or not I am experiencing the same issue on a completely unrelated PC.

PC could not pick up a DHCP address.

I have run:
netsh int ip reset - this removes the statically applied IP setting, IP address, SM and GW. DNS settings remain.
netsh winsock reset catalog
reboot.

this has not fixed it.

reapplied static IP, still not working.

interestingly, this can also not access the local network, maybe a different issue.
nobusCommented:
same problem on other pc does not necessary imply the same soltion works
Gareth McKeeCEO/OwnerAuthor Commented:
correct.

I will close this ticket as it has been resolved and open another if needed.

thanks for your help everyone.
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