FortiGate
FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.
mattchow_FTNT
Article Id 349997
Description This article describes a false error generated when importing a locally signed CSR certificate.
Scope FortiGate v7.4, v7.6.
Solution

The issue can be reproduced after importing the locally signed certificate, it can be observed by going to System -> Certificate -> Create/Import -> Certificates -> Import Certificate as shown in the screenshot below:

 

cert.jpg

 

The false error 'Unable to create certificate' will be seen right after uploading the certificate and selecting the 'Create' button:

 

cert.jpg

 

unable to create cert.jpg

 

However, the imported certificate status is still valid after import and can be used without any issues as shown below:

 

cert_valid.jpg
The issue will be fixed in firmware version 7.4.7 and 7.6.2 onwards.