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Crystal Reports causes LogOnException while exporting after a certain time

Hi, we have a 99% similar problem to the thread as below, only difference being we are facing the problem in Windows Forms application. Please refer https://archive.sap.com/discussions/thread/1145668

Our Scenario:

1. We are using a .NET Windows Forms application to print reports designed in SAP Crystal Reports 2011

2. Crystal Reports runtime version is 13.0.20

3. We export the report to disk file (TXT) before sending the text file to printer

4. We are using DataSets to supply data to crystal at run time

5. The reports are properly exported quite a number of times and runs fine for a few hours

6. Suddenly for no apparent reason the "Database logon failed" exception starts throwing up from the terminal

7. At that point the only resolution is to restart the application. Nothing else works.

We are stuck with this issue for quite some time now and have been chasing all forums to find for a suitable solution.

Help solicited as the issue is creating immense trouble for our customer as the number of invoiced being printed are quite high and printing keeps gets stuck intermittently.

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