Azure Data Factory - Copy data from AWS Redshift to Azure Synapse - Failed to connect error

Question

Hi,

I am trying to copy a table of data from AWS Redshift into Azure Synapse, below is the JSON code from the data factory:

{
    "name": "pipeline1",
    "properties": {
        "activities": [
            {
                "name": "Copy data1",
                "type": "Copy",
                "dependsOn": [],
                "policy": {
                    "timeout": "0.12:00:00",
                    "retry": 0,
                    "retryIntervalInSeconds": 30,
                    "secureOutput": false,
                    "secureInput": false
                },
                "userProperties": [],
                "typeProperties": {
                    "source": {
                        "type": "AmazonRedshiftSource",
                        "redshiftUnloadSettings": {
                            "s3LinkedServiceName": {
                                "referenceName": "AmazonS31",
                                "type": "LinkedServiceReference"
                            },
                            "bucketName": "matillion-data-dumps"
                        }
                    },
                    "sink": {
                        "type": "SqlDWSink",
                        "allowPolyBase": true,
                        "polyBaseSettings": {
                            "rejectValue": 0,
                            "rejectType": "value",
                            "useTypeDefault": true
                        }
                    },
                    "enableStaging": true,
                    "stagingSettings": {
                        "linkedServiceName": {
                            "referenceName": "DataLakeGen2pbiuksouthuk",
                            "type": "LinkedServiceReference"
                        },
                        "path": ""
                    },
                    "logSettings": {
                        "enableCopyActivityLog": true,
                        "copyActivityLogSettings": {
                            "logLevel": "Warning",
                            "enableReliableLogging": false
                        },
                        "logLocationSettings": {
                            "linkedServiceName": {
                                "referenceName": "DataLakeGen2pbiuksouthuk",
                                "type": "LinkedServiceReference"
                            }
                        }
                    }
                },
                "inputs": [
                    {
                        "referenceName": "AmazonRedshiftTable1",
                        "type": "DatasetReference"
                    }
                ],
                "outputs": [
                    {
                        "referenceName": "AzureSynapseAnalyticsTable1",
                        "type": "DatasetReference"
                    }
                ]
            }
        ],
        "annotations": []
    }
}

I get the following error after 30 mins of running the copy process:

ErrorCode=SqlFailedToConnect,'Type=Microsoft.DataTransfer.Common.Shared.HybridDeliveryException,Message=Cannot connect to SQL Database. Please contact SQL server team for further support. Server: '', Database: 'PowerBI', User: 'sqladminuser'. Check the linked service configuration is correct, and make sure the SQL Database firewall allows the integration runtime to access.,Source=Microsoft.DataTransfer.ClientLibrary,''Type=System.Data.SqlClient.SqlException,Message=A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server),Source=.Net SqlClient Data Provider,SqlErrorNumber=2,Class=20,ErrorCode=-2146232060,State=0,Errors=[{Class=20,Number=2,State=0,Message=A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server),},],''Type=System.ComponentModel.Win32Exception,Message=The system cannot find the file specified,Source=,'

What could this be related to?