Yellow Exclamation mark on network icon but we have internet

We are getting a yellow exclamation mark on our network icon and MS Office 365 says we aren't connected to the internet but we do get internet without any problems. We have tried the disabling of IPv4 TCP and UDP offloading with no joy. We have tried manually entering an outside DNS, no joy.
I am not sure what this is actually looking for. Some of the machines on the network show this and some don't. All machines are clones of each other.
Any ideas?
Thomas AnthonySecurity AdministratorAsked:
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JohnBusiness Consultant (Owner)Commented:
Some of the machines on the network show this and some don't.

Where I have seen this, the cause was the Antivirus installed and it needed to be upgraded. Try that.

On a problem machine, try updating BIOS, Chipset and network drivers. Does that resolve the issue on the problem machine?
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Thomas AnthonySecurity AdministratorAuthor Commented:
Actually the one I am working on was a fresh build. New OS, fresh install of AV, and new updated drivers including bios and chipset. Not a new machine, just a fresh install of OS and all programs.
I just checked one of the other machines that is doing this and AV updated this morning with reboot.
Thanks for the quick response.
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JohnBusiness Consultant (Owner)Commented:
Take the fresh build machine and uninstall the Anti Virus temporarily. Restart and check the network connection icon.
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Thomas AnthonySecurity AdministratorAuthor Commented:
No joy. Does anyone know what triggers the "exclamation mark"? It would be easier to diagnose if we actually knew what it is looking for.
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JohnBusiness Consultant (Owner)Commented:
There is something in your environment doing this. This is not a Windows issue.

Take one machine and do a fresh install of Windows (not your image). Set it up and test.  

If that works, your image may need refreshing.
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Thomas AnthonySecurity AdministratorAuthor Commented:
I can plug my laptop into their network and the same thing doesn't happen though? I have tested this with two different machines (laptops) and I also took a NUC that I use as a test machine in other environments and it works fine, too.
This machine was at my lab when I built it and didn't do this but when I took it into this network, it does.
Sorry to ask this again, but what is the actual trigger for the exclamation mark?

BTW, I didn't "image" it. I loaded it from a CD.
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JohnBusiness Consultant (Owner)Commented:
I can plug my laptop into their network and the same thing doesn't happen though? ....    but what is the actual trigger for the exclamation mark?

It is a conflict with third party software that affects network connections and Windows. In our case it was limited to Anti Virus which we fixed. In your case it seems a deeper problem with the image.
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Thomas AnthonySecurity AdministratorAuthor Commented:
I really appreciate your input.
Some of the machines we have fixed by disabling IPv4 offloading. Seems many other users have experienced the same issues as we have found a lot of blog info on this same issue. That worked on about 6 of the other machines but not on this one.
I need to dispell this confusion about the "image". When I mentioned the machines are all "clones" of each other, I may have given you the wrong idea. They are all the same model and make. Bought at different times, from the MFG. This problem just started about three weeks ago. No new software has been installed in this time.

If anyone else has an idea of what I can try I would appreciate it.
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JohnBusiness Consultant (Owner)Commented:
I have not have changed advanced network adapter settings. Most modern machines do not need changes here and have not done for 5 years or more.

That goes to my point of trying a fresh install of Windows (drivers and all), testing and see if you can correct it this way.
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Thomas AnthonySecurity AdministratorAuthor Commented:
Problem solved. I disabled IPv4 Checksum Offload. Found someone else with the same issue.
Thanks so much.
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JohnBusiness Consultant (Owner)Commented:
Thanks for the update. Decently modern machines don't need this, so maybe also check your overall network environment.
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Thomas AnthonySecurity AdministratorAuthor Commented:
Windows 10 machine. I've seen a lot of chatter on the internet about this lately. Wonder if something is going on.
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JohnBusiness Consultant (Owner)Commented:
We have a lot of Windows 10 Pro machines at numerous clients. All Intel NICs and all working fine. I am not sure what happened in your shop.

It was more than 5 years that I saw this with a handful of Windows 7 computers.

Interesting what you have determined.
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notacomputergeekCommented:
I have seen a switch cause these problems and after rebooting the switch, all was good.

Replace old network equipment.

It's also possible a bad NIC or bad switch port can spew garbage through the network causing odd problems.

Do the problem computers have a common NIC? If so, try updating the driver from the NIC manufacturer website, not the computer manufacturer website. e.g. Dell computer has an Intel NIC - get driver from Intel.

Move a problem computer to another Ethernet connection, different room, different switch, etc. to see if you have the same results.
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Thomas AnthonySecurity AdministratorAuthor Commented:
I am working remotely to will have to wait to reboot the switch as they are ‘dumb’ switches. The new machine is an HP and I got the nic driver from hp last night.
I just got an email from an old partner who had a bunch of Win 7 machines do this 2 months ago out of the blue. Said he did the same thing to fix. Seems really odd we are seeing this. I wonder if it could be from a Windows update conflict?
It would be next to impossible to track that down. :)
Thanks again for your quick responses.
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JohnBusiness Consultant (Owner)Commented:
I wonder if it could be from a Windows update conflict?

Windows 10 (for sure) updates Drivers as well as Windows. So this, coupled with your own environment, could have caused this.
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Rob HensonFinance AnalystCommented:
I have had this same issue  and have resolved it in a couple of way.

The icon is checking for a connection to a blank MS page, if it can't connect to that page then it says there is no internet, I thought I raised the same question last year but can't find it. The MS Page needs to be added as a trusted page to the AV configuration.

The other resolution is to use Command prompt to reset network adapter settings.

This link shows how: https://iihelp.iinet.net.au/Resetting_Network_Adapter_%28Winsock_Reset%29
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Rob HensonFinance AnalystCommented:
Found the web address:

http://www.msftmcsi.com/ncsi.txt

NCSI stands for Network Connectivity Status Indicator ie the icon on the task bar that gets the yellow exclamation mark.
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Rob HensonFinance AnalystCommented:
Disabling IPv4 may have helped but won't be the full issue.
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Thomas AnthonySecurity AdministratorAuthor Commented:
I have gone through all of the above information which I appreciate. On the machines that were still showing the yellow exclamation did not respond to anything else that I did. Spent a day and a half swapping rules on the firewall, disabling, uninstalling apps, swapping out switches.
At this point if I can fix them by simply disabling IPv4 Checksum Offload that takes 4 minutes and doesn’t affect anything else, I call that a win. Interestingly, if I re-enable it after the yellow explanation mark goes away, it doesn’t come back.
I am happy with this outcome.
Thank you all for you help.
Please close this case.
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