Go to the "Blackberry Server Configuration" applet and click on the "Administration Service - High Availability" tab. I have the following ports there (using BES and not BES Express):
HA JNDI 11100
Local JNDI 11099
If you have
there, it should work with: https://bas_server:3443/webconsole/login
What exact error message do you get in the browser?