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NUCUSER's avatar
NUCUSER
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Apr 14, 2021

SSL Client Certification Alert 46 Unknown CA

We are seeing 'Alert 46 Unknown CA' as part of the initial TLS handshake between client & server. From a wireshark capture, the 1st Client Hello is visible, followed by the 'server hello, certificate...
application delivery
BIG-IP
LTM
security
  • spalande's avatar
    spalande
    Apr 15, 2021

    Cool. If it's a web based application and browser is the client then yes it would be present. But if it's API call with server to server communication they might need to install it explicitly.

    ​

    ​Also, other thing I would check on the F5 clientssl profile, if CA cert is correctly added to the chain (in case it's not bundled with the server cert)? Meanwhile, please verify that part as well.

  • NUCUSER's avatar
    NUCUSER
    Apr 21, 2021

    Update - Thanks for all your suggestions, most helpful!! This turned out to be a client side cert password issue, client cert re-installed and now working.

NUCUSER's avatar
NUCUSER
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Hi Lidev

 

I already tried SSL dump and it did not appear to provide any more data than a standard wireshark capture. I will revisit.

 

Generic alerting is disabled/unchecked. The only alerts I see are generic SSL handshake failed messages for TCP source > dest (status code 1260013)

 

Thanks

Lidev's avatar
Lidev
Icon for MVP rankMVP
Apr 15, 2021

Have you try to enable SSL debug logging on the BIG-IP ?

tmsh modify /sys db log.ssl.level value Debug
  • NUCUSER's avatar
    NUCUSER
    Icon for Cirrus rankCirrus
    Apr 15, 2021

    Hi, we are running version 15 so low level debugging is enabled by default. I did try via tosh and it provided no additional logging

     

    Thanks