All computers that try to connect to my VM's VPN Window server 2022 gets this error. I don't know much about things like this since I am more of a database developer. I created a new VM VPN server from scratch using the same instructions that worked for me yesterday before the error showed up. Everything was working perfectly then I changed the DNS settings on my router (Changed the range of the IP address pool .100 to .200) I did this because I set my VPN server to assign IP addresses from a static pool of .50 to .99.
I tried:
Changing my DNS settings back
Turning off my firewall on server and client side
Uninstalling the WAN mini ports
Ipconfig release, renew, flush
Added AssumeUDPEncapsulationOnSendRule key in the Windows registry
Ran Network Adapter troubleshooter and Windows Network Diagnostics with no issues
Changed Type of VPN to Point to Point Tunneling Protocol (PPTP) from Automatic and checked Challenge Handshake Authentication Protocol (CHAP) and Microsoft CHAP Version 2 (MS-CHAP v2)
I am wondering if the issue is on the server side since I tested 2 computer and both show that error and can't connect.