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

Forum Discussion

Pihu_294516's avatar
Pihu_294516
Icon for Altostratus rankAltostratus
Sep 12, 2018

Connection error

Folks,   Can anyone help me how to troubleshoot this- Connection error: ssl_hs_rxhello:7664: unsupported version (40) Connection error: ssl_passthru:4060: not SSL (40)   What does the above err...
application delivery
big-ip
LTM
jaikumar_f5's avatar
jaikumar_f5
Icon for Noctilucent rankNoctilucent
Sep 12, 2018

Hi Pihu,

From the log 

not SSL (40)
, I assume the traffic coming to your virtual is not a ssl traffic traffic. Hence this error.

Can you share your configs here. Both 443 and 80.

Also check on the http Virtual (80), if it has a redirect to port 443 (https).

If 80 virtual is not present, have it created too with redirection irule http2https.