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zarev_316815's avatar
zarev_316815
Icon for Nimbostratus rankNimbostratus
Nov 01, 2017

Connection ERROR "Connection error: ssl_passthru:3994: not SSL (40) "

hi all,   currently i encounter"Connection error: ssl_passthru:3994: not SSL (40) " and try to investigate the cause of this error. is there anywhere to check the detail of this error?. or anythin...
application delivery
LTM
TMOS
Leonardo_Souza's avatar
Leonardo_Souza
Icon for Cirrocumulus rankCirrocumulus
Nov 01, 2017

Are you running v12 or above? If yes, here is the reason you are getting this in log messages:

 

https://support.f5.com/csp/article/K09322055

 

Anyway, that does not explain the error, so you need to take a tcpdump. The tcpdump will tell you what virtual server is generating the error, and also what is the traffic flowing.

 

https://support.f5.com/csp/article/K411

 

https://devcentral.f5.com/articles/getting-started-with-the-f5-wireshark-plugin-on-windows

 

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