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SBR does not support certificates signed by SHA-2 algorithm



Article ID: KB23075 KB Last Updated: 08 Mar 2017Version: 4.0
 This article describes the issue of certificates, signed by the SHA-2 algorithm, not being supported by SBR.
  • SBR server certificates are renewed by using a new 2048-bit root CA; so the new cert.cer files return with the new chain up to the new 2048-bit Root CA.

  • The cert.cer and server.sbrpvk files are imported into the Radius server, through the GUI. Unfortunately, clients reject this with the following error message:
    EAP-TLS authentication failed - client issued alert 'unknown root certificate authority
Root CA's such as VeriSign use SHA-2 to sign its new certificates. SBR will not work with these certificates, as it does not support certificates signed by SHA-2.

Alternatively, you have to check the following factors:

  1. SBR can handle 2048 bit certificates without any issues (both the GUI and the server itself). If any certificate is greater than 2048, it causes GUI and server issues. It can accept a 4096 bit root certificate, if it is manually copied to Root folder, found under the Service directory; otherwise 4096 server certificates are not supported at all.

  2. If the root certificate is changed and no longer matches the root cert, which signed the SBR server certificate, it causes the clients to fail. Installing the newly issued root certificate on the client should resolve the issue.

Note: For SHA-2 support, contact your sales or account team for assistance.
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