Bad Gateway During Data Exporting From Kusto To SQL

[tozhe]

I create a flow to regularly export some table data from kusto to sql server. But Table BuildInfo  fail to update with return error message Bad Gate from 5/9 3am while other table works fine. And I manually run the failed query in kusto also works fine. 

My Question is How do I fix this BadGateway error? What's the root cause of that?

This really block me for 3hours. Any help is great thankyou!