can not remove vty line on router

[ud0508500]

I have an Cisco 1812

Version 12.4(15)T3

line vty 0 3

exec-timeout 0 0

transport input none

transport output none

router(config)#no line vty 0 3

% Can't delete last 5 VTY lines

does anyone have an idea

[Edison Ortiz]

You won't be able to delete them. If you want to avoid anyone telnetting into the router, the commands you already have along with no login should do it.

HTH,

__

Edison.

[Richard Burts]

Edison

Actually no login will not do it. What no login will do is to allow access without checking any password. Configuring no exec is a much better way to make sure that no one uses them. And transport input none is pretty effective.

HTH

Rick