Changing table gives network error

We use Linux: Version: L2022.8.0.100.

We go to  Data Source->Table->Connection Settings->Change Table
We edit the table click Parse,
We click the Preview Data button and see the data,
But when we click the Done button to save the table changes, it gives Network error. 
`Network error: Network request failed with status: 502.`

Adding ss here. 

We restarted all the services, and the services are running as expected but that didn't solve the issue.