Hi,
Thanks for posting in Q&A platform.
When connect L2TP VPN successfully, may I know whether any other application which needs Internet access can work normally?
Besides google.com, can you access to other URL such as youtube.com? Have you try to browse it via other browser?
And here is an article regarding of configure L2TP VPN on Windows server 2019 for your reference.
Set up L2TP/IPSec VPN on Windows Server 2019
Best Regards,
Sunny
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