Error detected by database DLL. [On Page Server: server_name]

Question

We have a web app that launches Crystal Reports (version 8) in the crystal reports viewer that plugs into IE (version 6.0 & 7.0). The reports connect to SQL Server 2005. We have some reports that work but we have 2 reports that used to work but stopped working since we made the change. Whenever we launch the report from the browser we get
u2018Error detected by database DLL. [On Page Server: server_name]u2019
This is very frustrating as we have
1.     
Recreated the reports from scratch
2.     
Checked the connection to the database
3.     
We connect to the live server using Terminal Server and we installed Crystal on the terminal server and the reports run fine there.
4.     
We had the report s working after the modification but for some strange reason they stop working and we start getting the above error
5.
Also we have noticed that sometimes when we remove the query string (?sf=...) to the report it works (actually we get the login screen - but it works fine after that).
6.
Please note that the reports with the query string work fine on our test server and on my local machine connecting to a local copy of the database.
I am now very confused and would be very grateful for any help on this issue.
Best regards
Jose

Answer 1

Well, after much search I found and fixed the problem.
The problem was that I connect to two databases as part of a general view and our live server did not have the 'Crystal' user defined for the second (and less used) database. Once we defined the user on this second database it worked.
One comment I would like to make is that the friendly error message 'Error detected by database DLL. [On Page Server: server_name]' is not as good as the 'raw' message that we get when we finally connected Crystal to the live server database and try to run the report - it went something like 'you are missing a connection to the database database_name' - I wished I had this error from the start.