To troubleshoot issues with the BAS webconsole, you first need to understand that:-
(1) it is a SSL website
(2) it requires that you install the SSL certificate
+ a set of ActiveX components
from RIM when you are prompt for the first time when you access it on a web client like the Internet Explorer.
For you to realize No. (1), you need to pass No. (2) first. To complete No. (2), your browser needs to allow downloading of script files and ActiveX prompt for components installation. If you are not web savvy, my suggestion would be to enable all ActiveX items and script downloading options for your Internet Explorer under Tools > Internet Options > Security tab > Custom Levels for Internet and Local Intranet.
Also check if your computer has "Internet Explorer Enhanced Security Configuration
" installed. Remove it as per this link: Disabling Internet Explorer Enhanced Security Configuration
. Don't care about your browser security craps first, you can revisit them later. Anyway, it does more to lose your productivity instead of securing, you got lots of minor attacks on a daily basis anyway.
Once if above are cleared, the issues can be pretty much narrow down to some environment issues like another web server contenting with the default port 443 the BAS is using or your computer for BES has 2 NIC and hence 2 ip addresses and hence caused name resolution issues, wrong assignment of SQL static/dynamic ports, incorrect DNS record for the BES pool name and hence incorrect resolution issues etc etc... All these can be found by looking at the KB18185 which it consolidates all issues surrounding the page not found
Article Title: BlackBerry Administration Service - Application Server service does not stay running or 'Page cannot be found' is presented when contacting the BlackBerry Administration Service web console
Article Number: KB18185
Link: View Document