NAPS2.Console.exe - Error "TWAIN error: MaxConnections" when scanning again after canceling the scanning process (Citrix)

[rothtobi]

Describe the bug When using NAPS2.Console.exe within a Citrix session, we have the problem that the following error message appears during the next scan after clicking Cancel: "TWAIN error: MaxConnections"

To Reproduce

1. Start the Commandline: NAPS2.Console.exe --output "C:\TEMP\test.jpg" --force --progress --device "PaperStream IP SP-1125 #2" --driver twain --noprofile
2. Click on "Cancel" during scanning. The following appears in the console: "No scanned pages to export."
3. Start the Commandline again: NAPS2.Console.exe --output "C:\TEMP\test.jpg" --force --progress --device "PaperStream IP SP-1125 #2" --driver twain --noprofile The following error message appears: TWAIN error: MaxConnections No scanned pages to export.

Expected behavior The next scan should work if the previous scan was canceled.

Screenshots

Desktop (please complete the following information):

• OS: Windows Server 2019
• Version 7.4.3

Additional context

• We could not reproduce the problem with the NAPS2.exe instead of the NAPS2.Console.exe, here the connections to the scanner seem to be terminated correctly when clicking on Cancel.
• In order for the scanner to work again, the entire Citrix session must be logged off and logged on again.
• The NAPS2.Console.exe always terminated normally and no NAPS2.*.exe remained hanging.