Self Hosted Integration Runtime Error: The remote server returned an error: (503) Server Unavailable

Question

Hi,

we have a self hosted IR installed on a on prem server. I'm trying to copy a json file to a ADLS Gen2 Storage. It worked a while ago and when I use the preview feature, I can see the content of the file. Also while testing the connection with the ADLS connector, it shows it's successful. But when I execute the pipeline, I receive the following error message:

{  
    "errorCode": "2200",  
    "message": "ErrorCode=AdlsGen2OperationFailed,'Type=Microsoft.DataTransfer.Common.Shared.HybridDeliveryException,Message=ADLS Gen2 operation failed for: An error occurred while sending the request.. Account: 'dl*****212'. FileSystem: 'files'..,Source=Microsoft.DataTransfer.ClientLibrary,''Type=System.Net.Http.HttpRequestException,Message=An error occurred while sending the request.,Source=mscorlib,''Type=System.Net.WebException,Message=The remote server returned an error: (503) Server Unavailable.,Source=System,'",  
    "failureType": "UserError",  
    "target": "Copy data",  
    "details": []  
}  

Any idea why this happens suddenly? Is this maybe a firewall issue?

Edit:

The connection of the linked service is shown as successful:

Thanks and best regards

Answer 1

Hello @Z.K.Z ,

Thanks for the question and using MS Q&A platform.

As per the error message The remote server returned an error: (503) Server Unavailable - it could be sometimes a transient/intermittent issue as the calling service is too busy to handle requests, and it returns HTTP error 503. The recommendation here is to Rerun the copy activity after several minutes and see if that helps.

If the issue still persists, I would recommend you to please test your Linked service connections to ADLS Gen2 and Synapse and see if you could narrow down the root cause of the issue.

Else we request you to please trigger run the pipeline and do share the failed pipeline runID and failed activity runID including complete error message, so that we can further investigate into this and assist accordingly.

Hope this will help. Please let us know if any further queries.

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