So after some digging around I found the following solution.

Within Win10 registry it looks for a network connection either via the ethernet or Wifi at the following website...

Hi Bro67,

Thanks for the info will continue to look into it.

Hi Bro67,

We have several dell computers 7010, 790's on the domain network which are running win10 v1803, which have developed this problem. Running AD on the domain along with Sophos AV and XG...

Hi Samuria,

I have removed it from the domain (within control panel/system/change settings/) and placed it in a workgroup.
Rebooted and still the same icon and can still get out to the internet...

Hi,

Ran the following cmd netsh winsock reset and netsh int ip reset, still no joy. Regarding the firewall do you mean the windows firewall as this is controlled by the Group policy.
I did take...

OS: Win10 x64 - v1803
Dell workstation Optiplex 780, 7010
Onboard network - Intel(R) 82567LM-3 Gigabit Network.

Problem: Yellow network icon but still able to surf the interent (webpages), but...