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Windows - Prevent NIC from being disabled when VPN is setup

Lately we've started noticing an issue where on some laptops the LTE adapter would be shortly disabled and re-enable when attempting to setup a VPN (SSTP in our case).

We found out that there is a policy setting in Windows that is left to default values allows the operating system to disable unneeded network connections. In a nutshell it looks like once the VPN adapter is up and running the OS regards the LTE NIC as "superflous" and disables it. This obviously will then cause the VPN connection to be terminated.

Disabling the GPO setting shown in the screenshot below resolved the problem for us. Be aware that there might be unwanted side effects to this...

GPO settings

 

 

About the author

Mike Lucini

IT consultant of (almost) everything Java, SOAP, REST or otherwise web-related, with a touch of .Net when needed. Sporadic trouble (maker|shooter|fixer).