Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

mrichter's avatar
mrichter
Icon for Nimbostratus rankNimbostratus
Aug 04, 2015

APM: X509_verify_cert failed: error #: 20 at depth 0, error message:unable to get local issuer certificate

I'm having an issue with certificates on Macintosh systems generating this error when attempting to use client certification authentication.   I have the proper CA-bundle applied and a similar c...
BIG-IP Access Policy Manager (APM)
security
njseq's avatar
njseq
Icon for Altostratus rankAltostratus
Nov 27, 2019

Hi guys,

I'm having this issue on a particular machine. It has a machine certificate installed and working but Edge Client inspects the machine but does not find it. It gives me that same error: X509_verify_cert failed: error #: 20 at depth 0, error message:unable to get local issuer certificate

What can it be? What is missing? Other machines work fine...

Thanks.

NS