I have the similar problem on Crystal Reports 2008 and MS SQL Server
The steps I did
Steps
Log on to Remote desktop
Open Crystal Reports IDE
Open Report and run, it works fine.
Now Log on to CMC
Publish the Crystal Report
Right click on report and choose Default Settings
Click on Database Config
Displays the user name
Close settings
Right click on report and choose Run Now
Report runs
Click on report and choose History
Instance status shows "Failed"
Can some body help please?
Another scenario I went to Database configuration retyped User Name and Password and save in Default Settings of report. Still the result is same but the message is Database Vendor Code 18456.
Can some body help please?