I am trying out Megento CE 126.96.36.199 which was installed on a shared server via Softaculous (Cpanel).
All apears to work until trying to access Magento Connect Manager when a 'invalid user name or password' message is presented despite the correct details having been entered.
Any suggestions would be of great help as there appears little available with a google search.
Verify that the credentials are proper while entering? Also try creating a new user and login with that.