Windows 10 Limit for concurrent SSTP VPN connections

Mehrdad Alaei 0 Reputation points

Windows 10/11 allow for 2 concurrently connected SSTP VPNs...these are connected to Windows servers running RRAS. If you try to connect a 3rd SSTP VPN, you get an error "the modem is already in use...etc".

The same with PPTP VPN, only 2 concurrent connections are allowed...a 3rd results in the same error.

You can connect 2 SSTP and 2 PPTP concurrently...but no more.

Does anyone know of a registry key that is controlling this limit? Or some way to bypass this limit...knowing that each VPN subnet would need to be unique to avoid routing issues.

Windows 10
Windows 10
A Microsoft operating system that runs on personal computers and tablets.
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Windows 11
Windows 11
A Microsoft operating system designed for productivity, creativity, and ease of use.
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  1. Yanhong Liu 3,965 Reputation points Microsoft Vendor


    Thank you for posting in Q&A forum.

    In Windows 10/11, the limit on the number of SSTP VPNs and PPTP VPNs connected simultaneously is determined by system policies rather than controlled by registry keys. Windows 10/11 is designed to only allow two concurrent VPN connections of the same type because the operating system uses the same virtual adapter for the same type of VPN connections. When you try to make a third connection it will fail because the virtual adapter is already in use.

    Currently, the Windows operating system does not provide a direct way to modify this limit. If you need to establish multiple VPN connections simultaneously, consider using a virtual machine. Configuring a different VPN connection in each virtual machine allows you to bypass the host operating system's connection restrictions.

    I hope the information above is helpful.

    Best Regards,

    Yanhong Liu


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