switch# no radius-server host {ipv4-address} authenticationAs this operation causes both accounting and authentication to be disabled for the server, it is denied. switch#switch# no aaa authentication login default group radiusswitch#switch# no radiu...

https://www.cisco.com/c/en/us/support/docs/security-vpn/public-key-infrastructure-pki/215118-ios-self-signed-certificate-expiration-o.html