react-native-debugger
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Show failures when 'Waiting for client connection (port 19001)' happens
React Native Debugger app version: 10.15.1 React Native version: 35.0.0 Platform: iOS 13.1 Is real device of platform: No; simulator Operating System: macOS 10.15.1 Catalina
When there is some kind of version mismatch between React Native (with or without Expo) and RND cannot connect, you get this window:

It's very frustrating - I only work in this area sporadically, and it seems like every month I get this and have to piece together (1) why it's happening and (2) which versions are out of date.
Could there be some kind of debug / diagnostics info about what the responses were on the port? Some kind of "we tried to talk to port ABC but the response was declined with XYZ" would be swell.
/cc @jonsamp, who has previously listened to me gripe about RN versioning.
I have the same issue related to version. Do I have download a newer version of React Native Debugger?
Same issue. @JoshuaKGoldberg Did you solve the problem?
No, I stopped working in React Native a couple of years ago 😄
I'm getting the same issue
Closing out my old issues I no longer have context on. If anybody else is still seeing this, I'd encourage you to file a new issue with more information. Cheers!