API4.12:webscene无法添加FeatureLayer

我在往WebScene里添加FeatureLayer时报错:
001.png

 

 "Connection to TRAIL.ARCGISONLINE.CN:9876 refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections." 
 
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许丹石

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 Check that the hostname"TRAIL.ARCGISONLINE.CN" and port"9876" are correct and that the postmaster is accepting TCP/IP connections.

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