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KarimBenyelloul's avatar
KarimBenyelloul
Icon for Cirrostratus rankCirrostratus
Jul 21, 2025
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Which Certificate Fields Does BIG-IP Alter When Using C3D?

Hello everyone, When the C3D feature is enabled, the BIG-IP generates a new client certificate to authenticate to the back-end server. I would like to understand which fields in the newly generated ...
C3D
certificate
client certificate
LTM
tls
  • VGF5's avatar
    VGF5
    Jul 21, 2025

    Hello KarimBenyelloul​ 

    The issuer and validity period are always changed.  The serial number in the C3D-forged certificate is, by default, copied from the original client certificate. However, this is not guaranteed in all cases. There are known bugs (such as Bug ID892485 referenced in KB K00185847) where the serial number may not be acquired or copied correctly, which can cause issues with OCSP validation and caching.