Hello. My supervisor wants to use SDM to manage our 1841 router but with secure access (https). I have already set this up for http access but I am having problems with the secure server command. When I run the command ip http secure-server in Global Configuration mode the IOS tells me "invalid input at marker" and points to secure-server as the problem. I read somehwere that I need to obtain a certificate or generate a rsa key pair with the command "crypto key generate rsa" but this command is not recognized as valid either. Do I need to upgrade my IOS (currently version 12.4 (3i). What am I doing wrong? I just want to enable https access for SDM. Please, any help would be very appreciated.