The most common reason for Griid connection failure is that the iPad/iPhone does not have an IP assigned. Once you connect to an ad-hoc network, it can sometimes take up to a full minute for an IP to be assigned.
To check that your iPad/iPhone has an IP assigned:
- Go to the Settings app / Wi-Fi tab.
- Tap on the blue arrrow for the Wi-Fi network you're connected to.
- Your iPad's IP should be listed here. If you see an IP, that means you're connected.
If there is no IP assigned, make sure you wait for at least a minute, it can take this long for IPs to be self-assigned. Otherwise try creating a new ad-hoc network on the computer and reconnecting with the iPad.