Microsoft says that computers with a wireless wide area network (WWAN) LTE modem may lose Internet connectivity after installing the Windows 10 KB4556799 cumulative update.
WWAN modems allow mobile devices, such as laptops, to connect to a cellular network and use the Internet while traveling.
These modems are either integrated into laptops or can be purchased in the form of mini PCI-E adapters or USB adapters.
Windows 10 incorrectly states your connected to the Internet
In an update to the Windows 10 KB4556799 support bulletin, Microsoft states that Windows 10 devices using WWAN LTE modems may not be able to connect to the Internet, but Windows 10 will indicate that everything is working correctly.
“After installing this update on a Windows 10 device with a wireless wide area network (WWAN) LTE modem, reaching the internet might not be possible. However, the Network Connectivity Status Indicator (NCSI) in the notification area might still indicate that you are connected to the internet,” says Microsoft.
Microsoft states that they are working on resolving this issue and hope to have it fixed in an “upcoming release.”
Other issues reported in the KB4556799 update
The most common complaint with this release is not being able to install the update and receiving various error codes when attempting to do so.
Today, Microsoft had stated that their telemetry does not indicate that these issues are widespread, but are investigating and monitoring the reports they receive.