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

Forum Discussion

Jibinpv_254622's avatar
Jibinpv_254622
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Feb 27, 2017

F5 sends TCP RST after handshake

We have implemented an Client authentication on one of our services to client. Post that client is getting authenticated fine however ,a TCP RST has been send to client by F5 after the handshake. W...
application delivery
LTM
Jibinpv's avatar
Jibinpv
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Mar 15, 2017

Many Thanks James.

 

Have followed the TCP dumps and after analyzing the output we were clearly been able to see the connection request and the reset.

 

Well the strange thing was that the reset happens as the connection was send to wrong backend server.

 

And this was been happening due to SSL persistence enabled on the VS. Also as we are using irules for pool selection ,the SSL persistence record get it messed up.

 

We have the issues fixed by removing the SSL persistence from VS and applied it via irule.

 

Regards,

 

Jibin