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During a PTV Visum session the title bar shows the string 'INVALID DONGLE HANDLE' and an error message is shown:
'One of the following licenses is requiered:
. CodeMeter 100321:900000000
Failure reason: The request cannot be sent to another CodeMeter License Server, Error 102.'

Some antivirus software like F-Secure offer a 'Deep scan function', which might lead to the termination of CodeMeter. To prevent this, add the CMRuntime.exe to the antivirus whitelist.