Is the admin console you mentioned the one provided by Unisys? If so, and if you used the admin console to create the 'devl' configuration, you should have a JBOSS_HOME/bin/JBossConsole/devl-stop.sh script. Just run that to stop the 'devl' server.
If not, try the following when running shutdown.sh:
./shutdown.sh -s <your-host-name>:<jndi-port>
For example, when I used the admin console to create the 'devl' server, to shut it down I type:
./shutdown.sh -s usmv-johnsop1-l:1199
Hope this helps.