AWS Bedrock: Troubleshooting SharePoint Sync “Invalid Certificate Format”

If you’re trying to set up an Amazon Bedrock Knowledge Base with SharePoint as the data source and run into errors, here’s a solution to help you get past the certificate issue.

The error message indicates that the data source failed to sync because of an invalid certificate format. Specifically, it mentions that the certificate failed to load as either an X.509 or PKCS12 format because of invalid fields. To fix this, you need to upload a valid certificate in either PKCS12 (.p12 or .pfx) or PEM (.crt) format.

In your setup, you created a self-signed certificate using OpenSSL. You generated two files: a PFX file that contains the private key and a CER file uploaded to Microsoft Entra ID for authentication. The certificate was created with OpenSSL 3.2.1, using a 2048-bit RSA key, with a validity period of a year. You verified the PFX file successfully, and the certificate’s thumbprint matches the uploaded certificate in Entra ID.

Despite this, the sync still fails, which suggests that the issue might be with the certificate format or how it’s configured for Bedrock.

Here are some steps to help troubleshoot and resolve the issue:

1. Check the Certificate Format:
   Make sure that the certificate you upload is in the correct format that Bedrock expects. Generally, this should be a PKCS12 (.pfx or .p12) file with the private key included. The self-signed certificate you generated should work if the format is correct.

2. Verify the Certificate Content:
   Ensure the PFX file contains both the certificate and the private key. You can verify this with OpenSSL commands:

   openssl pkcs12 -info -in SharePointAWSApp-OpenSSL.pfx

   When prompted for the password, check that the certificate details are correct and that it includes the private key.

3. Check Compatibility:
   Confirm whether Bedrock’s SharePoint connector explicitly supports self-signed certificates. Some systems only accept certificates issued by a trusted Certificate Authority (CA).

4. Use Proper Encryption Settings:
   When creating the certificate with OpenSSL, ensure you use compatible encryption and key algorithms. RSA 2048-bit keys are generally supported, but double-check any specifications for Bedrock.

5. Follow Official Recommendations:
   If you learn that self-signed certificates aren’t supported or encounter persistent issues, consider obtaining a certificate from a trusted CA. Often, this provides better compatibility and security.

6. Update Documentation and Support Channels:
   Contact Amazon Bedrock support or consult the official documentation for details on which certificate formats are recommended and supported for SharePoint integrations.

Following these steps should give you a clearer picture of what might be causing the sync error. Ensuring your certificate is in the right format and properly configured is key to successful integration. If issues persist, trying a certificate issued by a trusted CA or consulting official support can often resolve compatibility problems.