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The CLI which would help you to alter the TLS version on IOS would be:
router(config)#ip http tls-version ? TLSv1.0 Set TLSv1.0 version Only TLSv1.1 Set TLSv1.1 version Only TLSv1.2 Set TLSv1.2 version Only
This CLI was introduced to the fixed vers...