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Barracuda Web Application Firewall

Why do I receive the error ?Issuer of the certificate cannot be trusted?, when accessing a web page behind the Barracuda Web Application Firewall?

  • Type: Knowledgebase
  • Date changed: 3 years ago

Solution #00003978



All Barracuda Web Application Firewalls, all firmware versions.



This error is usually seen if the web site is using a self signed certificate or if the browser is unable to verify the trusted chain in a signed certificate.


A signed certificate is a certificate obtained form a third-party certificate authority, like Verisign or Thawte. When a certificate authority signs a certificate they send their signed certificates back, in a package or individually. All of the certificates received from the CA need to be installed on the Barracuda Web Application Firewall. If one of the certificates is missed, the trust chain is considered incomplete.


If a signed certificate was uploaded without the intermediary certificate, you will need to combine the intermediate and root certificates into one .pfx file, and upload it to the Barracuda Web Application Firewall. If you loaded the certificate and the certificate key separately, you will only need to upload the intermediate certificate (*.pem format).  


Signed certificates can be loaded to the Barracuda Web Application Firewall from the BASIC > Certificate > Upload Certificate section. 


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