Failed to get access token by using service principal. ADAL Error: service_unavailable while trying copy activity using datafactory

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While performing a copy activity using Azure datafactory, Copy activity fail with the following error:

Failed to get access token by using service principal.
ADAL Error: service_unavailable, The remote server returned an error: (503) Server Unavailable.

What is the cause for this? and how should I resolve it? please help.

Jan 2 in Azure by anonymous
• 18,640 points

edited Jan 2 by anonymous 1,024 views

1 answer to this question.

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When the Service Token Server (STS) owned by Azure Active Directory is not unavailable, i.e., too busy to handle requests, it returns an HTTP error 503 which says that service is unavailable.

Rerun the copy activity after several minutes. This should resolve the error.
answered Jan 2 by Sirajul
• 58,130 points

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