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How to Fix SSRS REST API Error 1027 When Uploading RDL Files

WPS Editor Oct 1, 2026 869 views

Question details

The user encounters Error 1027 and an invalid-character encoding error when trying to upload an SSRS report definition (RDL file) using PowerShell and the SQL Server 2019 Reporting Services REST API.

How to Fix SSRS REST API Error 1027 When Uploading RDL Files

Product: SQL Server 2019 Reporting Services (SSRS)
Device & OS: not provided
Scenario: Uploading an RDL report file programmatically using PowerShell and the SSRS REST API.
Observed behavior: The upload fails with error 1027 and an invalid-character encoding error at a specific line and position, despite succeeding when uploaded manually via the SSRS web portal.

Before you start

Ensure you have a text editor capable of viewing detailed file encoding properties (like Notepad++ or Visual Studio) and administrator access to your SSRS environment.

Solution 1Recommended

Verify and Fix RDL File Encoding for PowerShell Upload

Check the file encoding of your RDL file and ensure your PowerShell script reads and transmits the payload with matching character encoding.

The SSRS web portal automatically handles certain encoding variations during manual uploads. However, strict REST API requests will reject payloads if the actual file encoding differs from the XML declaration or the HTTP request headers.

Locate the exact error position

Review the SSRS Error 1027 message returned by PowerShell to identify the exact line and position of the invalid character.

Inspect the RDL file

Open the RDL file using an advanced text editor. Navigate to the line and position mentioned in the error to check for hidden or special characters that may be causing parsing failures.

Standardize file encoding

Ensure the RDL file encoding matches its XML declaration. Save the file explicitly as UTF-8 (preferably without BOM) using your text editor.

Update the PowerShell script

Modify your PowerShell upload script to explicitly enforce UTF-8 encoding. Use parameters like '-Encoding UTF8' when reading the file with Get-Content, and ensure your Invoke-RestMethod call specifies 'charset=utf-8' in the Content-Type header.

Verify and Fix RDL File Encoding for PowerShell Upload

Testing Your Fix: Run the updated PowerShell script with a single, simple RDL file first to confirm the encoding mismatch is resolved before processing bulk uploads.

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Frequently Asked Questions

Why does the RDL file upload successfully via the SSRS web portal but fail via PowerShell?

The SSRS web portal automatically manages certain encoding anomalies and file headers during the upload process. PowerShell REST API calls are much stricter; if the payload's encoding does not perfectly match the REST endpoint's expectations and the XML declaration, it will throw an error.

What does Error 1027 mean in SQL Server Reporting Services?

Error 1027 typically indicates an invalid character or schema validation failure during XML or RDL parsing. It occurs when the report server encounters a byte or character that is illegal within the file's declared encoding format.

How can I specify UTF-8 encoding in my PowerShell REST API request?

When reading the file, use the -Encoding parameter (e.g., Get-Content -Path 'report.rdl' -Encoding UTF8). Additionally, when making the API call with Invoke-RestMethod, ensure your headers define the content type correctly, such as 'Content-Type' = 'application/xml; charset=utf-8'.

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