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Benjamin_8557's avatar
Benjamin_8557
Icon for Altostratus rankAltostratus
May 11, 2016

[Certificate Client Authentication] ERR_SSL_VERSION_OR_CIPHER_MISMATCH

Hi,   I use client certificate to authenticate access to a web service. The client certificate is self-signed and I check it with the default BigIP CA.   But, when I request the web service w...
BIG-IP
LTM
security
Yann_Desmarest_'s avatar
Yann_Desmarest_
Icon for Nacreous rankNacreous

Hello,

 

This message indicates that the SSL version or the Cipher list supported by the F5 and its peer (the client) doesn't match.

 

You should do a tcpdump on the client or on the F5 system to check the ssl handshake. You may see that there is no matching ciphers between the browser and the VS.

 

You can also setup the debug level for SSL on System >> Logs >> Options

 

Yann_Desmarest_'s avatar
Yann_Desmarest_
Icon for Nacreous rankNacreous
May 11, 2016
How did you configured the Client certificate option : Require, Request or Ignore ? If set in Require, try setting Request and TLS1.2 enabled Moreover, the TLS_FALLBACK_SCSV option allow the server (bigip) to reject a connection if the client use TLS1.1 and the TLS_FALLBACK_SCSV field but the server support at best TLS1.2. When Client Certificate is enabled, the client may try to establish a session using TLS1.1. And without client cert, the client may use TLS1.2.