User Unable to Connect to VPN

[Leitz_IT]

Hello,

I have a user that is working remotely using Windows VPN; she hasn't had any issues up until yesterday when she was unable to connect to the VPN (been working remotely ~6-8 months now). I don't know if there was a possible windows update that is preventing her from connecting; but we have 20-25 users that connect via the VPN and she is the only user that isn't able to get a connection.

I've been able to remote to her PC and change the credentials, but continuously get a 789 error..

We use a preshared key and connect PAP..

I'm at a bit of a loss; unable to figure out why she is unable to connect but all other users can. I believe it is something with windows blocking her or perhaps a firewall update. But as I mentioned she had no issues connecting up until yesterday.

[JPena]

Hello!

Our client VPN troubleshooting doc goes over some potential causes for the 789 error you're seeing - https://documentation.meraki.com/MX/Client_VPN/Troubleshooting_Client_VPN#Windows_Error_789

[Leitz_IT]

Hello,

I did look over the VPN Troubleshooting Document but didn't have any luck..

"Firewall blocking VPN traffic to MX
Solution: Ensure UDP ports 500 (IKE) and 4500 (IPsec NAT-T) are being forwarded to the MX and not blocked. If traffic cannot reach the MX on these ports, the connection will timeout and fail."

I think this may be the only factor (Firewall blocking.) Our company just uses Windows Defender Firewall thought and there haven't been any updates. Is there a detailed writeup to ensure UDP Ports 500 (IKE) and 4500 (IPsec NAT-T) are being forwarded? I am not too familiar with how to do this..

[PhilipDAth]

789's are often caused by the large Windows Updates deleting the PSK or changing the authentication to something other than PAP.

Delete the VPN connection and re-create it.

You could also try my client VPN wizard which uses the VPNv2-CSP engine in Windows 10 which does not seem to have these issues.

https://www.ifm.net.nz/cookbooks/meraki-client-vpn.html