Intermitten message "u00C9chec de la connexion au serveur" in a thick client

In a java thick client (JRC) and use of a POJO resultset, we have a intermitten message "Échec de la connexion au serveur" or "Failed connextion to server".
Can you help me ?
We use a Crystal Reports XI R2 SP2 and the JRC, Crystal Report Viewer 2.1.21.2.
Thanks !

When you say the issue is intermittent, is it random, or consistent depending on an action - running a report a second time, etc?
What database type was the report designed against - POJO, or some other database type? 
The basis for the error message you're getting is that something went wrong when trying to connect to the data source to retrieve data. 
More information is required to narrow down this issue.
Have you turned on Log4J logging, and looked at the trace output?
JRC comes with a sample log4j.properties file, that you can edit to configure the logging.  If you set the debug level from ERROR or WARN to DEBUG, you'd get far more info as to what may have gone wrong.
Sincerely,
Ted Ueda

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