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Internet Solutions


Client certificate is untrusted or invalid


Some web sites require you have a special "certificate" to access the site. This typically occurs with higher security sites, such as a corporate web site for employee access only. It appears you have the certificate, but it not usable.

Server Error

403.16 - Forbidden: Client certificate is ill-formed or is not trusted by the Web server.

Your client certificate is untrusted or invalid. A Secure Sockets Layer (SSL) client certificate is used for identifying you as a valid user of the resource.

Error messages will differ depending on the web server and if replaced by the web site designers.
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Frequency is relative to other Internet warnings and errors.
  Solutions and Fixes  
Get New Certificate
    Add    Flag
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You will need to contact the web owners to get a new certificate (what is called a client SSL certificate).
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  FaultWire Staff
Posted: 26-Oct-2008
  Official Explanation  
  technical detailsThe client browser tries to use a client certificate that is not trusted by the server that is running IIS 7.0 or that is not valid.

(From Microsoft - The HTTP status codes in IIS 7.0)
Additional notes for the web server administrator - Microsoft Knowledgebase article 942061.
  Forum Help  
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Check out what others say about this issue and review or add your own comments and solutions!

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  Research this Issue  
Getting search results...
  "403.16 - Client certificate is untrusted or invalid" is only supported by Microsoft IIS (Internet Information Services) web servers.

The four hundred series of errors indicate something was sent to the remote web server incorrectly.
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