We all know the Client VPN has its weakness and troubleshooting those issues can be somewhat of a pain. To help I am providing a guide of fixes/suggestions found in the community (Not specifically endorsed by Meraki 😉). This is definitely a WIP (Work in Progress) type of guide. I will try to add items and format the guide with time. Ideally in time organizing them by OS/Auth/Error Code is my goal. If you have any suggestions I have missed please reply so I can add them.
Reboot device having issues
Does the MX have a public IP?
Is the client behind a NAT device? Run tracert to verify
Has support changed your encryption settings?
Use a different internet connection (hotspot or mobile) to test
Verify device is not behind the MX trying to VPN to?
Is the MX behind a device doing NAT (ISP Modem – bridge if possible)?
Any other 3rd-Party Software on the affected system that could be causing an issue (Endpoint security, AV, etc.)?
Have you tried a different device to VPN in with? (using a phone helps to rule that it is a device issue and not Meraki )
@SoCalRacer First of all, I appreciate the effort put in to get the list of steps.
We also have a detailed KB Article that lists the steps, error codes and their meaning that would help us in troubleshooting the Client VPN connectivity problems. If you see anything missing in the KB, please do submit a suggestion on the dashboard using the "Make a Wish" button and we will be glad to take a look at it.
There are a fair number of posts here on the community with people having problems with Client VPN. I don't think it's any secret that the Meraki docs don't cover every aspect of troubleshooting client VPN, especially on Windows. I think posts like this, and scripts created by people like @Nash are tremendously helpful to people who are trying to Google solutions.
And no offense, but we all know that making a wish is mostly likely one of the slowest ways to get something added/modified/changed.