Can't login to router

Hi all,Blakeexz here

I'm trying using Radius as AAA server for login to router. The commands aaa new-model, aaa authentication, radius-server host command setup okey. Initially, the commands "aaa authentication login default group radius" works, and I can login to router. Secondly, I add a new the command "aaa authorization command 1 default group radius" also works, and I also can login to router. Finally, after I CHANGE the command TO "aaa authorization exec default group radius", I got "This line may not run ppp" when I try to login, then exit. (I'm connecting to router through ethernet interface.)

Why I can't login to router any more?

pls help

The authorization command causes a request packet containing a series of AV
pairs to be sent to the RADIUS or TACACS daemon as part of the authorization process. The daemon can do one of the following:

a.. Accept the request as is.
b.. Make changes to the request.
c.. Refuse the request and refuse authorization.

For a list of supported RADIUS attributes, refer to the appendix "RADIUS
Attributes" in the Cisco IOS Security Configuration Guide. For a list of supported TACACS+ AV pairs, refer to the appendix "TACACS+ Attribute-Value Pairs" in the Cisco IOS Security Configuration Guide.

What's the difference between keywords "EXEC" and "COMMAND" in aaa authorization command?

pls help

This is the difference between two commands

Exec
Runs authorization to determine if the user is allowed to run an
EXEC shell. This facility might return user profile information such as
autocommand information.

Commands
Runs authorization for all commands at the specified privilege
level.

A user on our network was having the same problem. To correct it, I had to remove the switchport trunk access commands that were associated with the appropriate port on the switch and add the proper switchport mode access commands. Once I made the change to this port, the user was able to telnet with no problem.

Thanks Oswald and enzo for solving my problem. good work guys just keep it up. :thumbup1: