Problem Description: I am experiencing a sudden connection failure with the App Inventor Emulator in a computer lab environment (all PCs are equipped with recovery cards/deep freeze, so the system environment remains identical). It was working perfectly last week, but since this week, the emulator c…

The fix should be live on all servers now.

aiStarter Connection Issue

ABG March 18, 2026, 3:38am 2

I recommend getting the Companion running on whatever emulator works for you, and using the Connect -> Companion sequence

See the FAQ for examples