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

Forum Discussion

Suresh_Jo_32729's avatar
Suresh_Jo_32729
Icon for Nimbostratus rankNimbostratus
Apr 02, 2018

Getting Verify return code: 21 (unable to verify the first certificate) error message.

All,   I have uploaded same ssl cert in two different LTMs, in device it's working fine but in other device I am getting Verify return code: 21 (unable to verify the first certificate) error messa...
LTM
security
Suresh_Jo_32729's avatar
Suresh_Jo_32729
Icon for Nimbostratus rankNimbostratus
Apr 04, 2018

I am creating ssl cert for ssl profile.

 

I have imported intermediate chain too, what I did in the ssl cert tab I copied contents of both the cert (ssl and intermediate). After that I got the verify code 20 instead of 21.