Does anyone know of a migration utility that will migrate from Sonic firewall to Watchguard? I found a Sonic utility that migrates from WG to Sonic, but I've not found one that migrates from Sonic to Wg.
We don't have a utility like this. Conversion tools like this tend to not be very reliable.
When you start the firewall up, it'll deploy a configuration with basic proxies, webblocker, app control, and IPS configured.
If you have any questions, issues, or concerns, I'd suggest opening a support case or posting here.
WatchGuard Customer Support
Once you have created a WG config, you could try converting it to the Sonicwall config, and see if the old & new Sonicwall configs match, which should help identify if there are things that you missed in creating the WG config.
And it may show how good the Sonic conversion utility really is or isn't.