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Answer

The username that is used to login is saved into the BVMS logbook and can be found by searching the logbook from the Operator Client (username of login is "blabla").

The details of the workstation (mainly the IP address) is logged into the BVMS client log files. These can be found on the workstations in the directory: C:\ProgramData\Bosch\VMS\Log

(Hint: for log file analysis a lot of free / open source tools are available. Snaketail is one of these tools, and can be found here.)

Open the BVMSClientLog.txt (there could be multiple files which are all related to a different timeframe) and search for the phrase "InvalidCredentialException". If an user has tried to login to the system the following log lines should be present in the log file:

2019-03-17 18:31:53,668 75516 [GUI Thread] INFO Bosch.Vms.Frontend.OpClient.Wcf.DataAccessServiceClient ConnectAndAuthenticate - Call failed with InvalidCredentialException
2019-03-17 18:31:53,670 75518 [GUI Thread] INFO Bosch.Vms.Frontend.OpClient.ServerManagement.CentralServerManager AuthenticateAtMainServer - Main-Server 192.168.20.190: WCF online authentication result is WrongUserOrPassword

This needs to be checked for every workstation which runs the BVMS Operator Client.