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

Forum Discussion

Doran_Lum_13484's avatar
Doran_Lum_13484
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Oct 08, 2016

How to check if TLS 1.0 is enabled

Hi all i'm running F5 LTM VE 12.0 and i'm wondering how do i know if TLS 1.0 is enabled for my ssl client and server profiles. I left most config as default except the certs.  
application delivery
big-ip
LTM
ssltls
Hannes_Rapp's avatar
Hannes_Rapp
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Oct 10, 2016
  • (Config check method) Replace DEFAULT with the actual cipher string in your clientssl profile (or serverssl profile)

In BigIP BASH shell:

 

tmm --clientciphers "DEFAULT"
tmm --serverciphers "DEFAULT"

 

If any lines of the output include PROT = TLS1, it's enabled, otherwise not.

If output contains cURL (35) error code, TLSv1 is not available.

  • In case of publicly available web-sites, you can use many of the available online SSL-checkers (https://www.digicert.com/help, Qualys, Symantec...)
  • Josh_Jacobson_4's avatar
    Josh_Jacobson_4
    Icon for Altostratus rankAltostratus
    Oct 10, 2016

    One caveat for this: make sure to enclose the cipher string in single quotes if it has an exclamation point in it. SOL15194 has a great deal more info.