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

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Satoshino's avatar
Satoshino
Icon for Cirrus rankCirrus
Jul 10, 2020

SSL Handshake failed for TCP

Hello everyone,   I receive this error during TCP handshake: 86 3 0.0585 (0.0332) S>C HandshakeError: short handshake length: expected 52971 got 16380   How i fix the handshake length?   ...
big-ip
devops
LTM
security
tcp
Samir's avatar
Samir
Icon for MVP rankMVP
Jul 11, 2020

When the SSL record layer contains handshake data larger than 16384 (2^14) bytes, the BIG-IP system does not fragment the data. This is known issue and F5 has identified as a bug[ID: 664528].

 

This happens when you configure a large certificate or certificate chain for server or client authentication, at either the client or server SSL profile, respectively.