I would like to know the command on how I can disable the TLS v1.0 and v1.1 in the Cisco ISR4321/K9 and just retain TLS v1.2 ?
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The ability to specify TLS version was added in IOS-XE 16.4.1 so you will want to make sure you have that version or later.
To specify version you can use the following commands:
ip http server tls-version TLSv1.2 ip http client tls-version TLSv1.2