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Hello, when I git clone the newest code , and then `prefect dev start`, I found that the UI is blank

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Hi Howard, what are the steps you performed to get to here?
We don’t natively expose on :3000, so I suspect there is something else going on

`prefect dev start` will run the UI on port 3000 and the Orion API on port 4200, but it looks like perhaps Orion didn't start and as a result, the UI isn't able to communicate with it.

I'd begin by running `prefect orion start` to run a standalone Orion server. That will make it easy to see any errors that are preventing the API from starting up.

Actually Orion API was started. And I can't access <http://10.41.6.40:4200/api/helath> and <http://10.41.6.40:4200/ui-settings>.
I want to use the hot reloading feature of development, but if it can't be used, I'll try to use `prefect orion start` , thank you all!

if the ui is blank..you should build the orion-ui first. follow the steps in orion-ui/readme