Hi
You have to use Infoview for remote users to access ,Also check with your IT admin group for any security issues when granting remote access to users.
Infoview is another web-based interface which you can use to give user access to view the reports that you have published on Crystal Reports Server ot Business Objects XI ,before you give access to used you will need to set Rights at Group Level or User Level ,Also you need to check the type of authentication you are using when users log-in.
Cheers
Rahul