if you are using BC web client and you start facing abnormal behavior when trying to log in and unexpected errors please find the below analysis
SYMPTOM:
Web Client sporadically does not start. Error message:
Error accessing the website
Type: System.IO.IOException
Message: The process cannot access the file "C: \ inetpub \ wwwroot \ BC \ wwwroot \ Resources \ ExtractedResources \ Action_8ball_32x32.png" because it is being used by another process.
RESOLUTION:
Sometimes the Windows Defender held a lock on one of the Resource files, so please Add the BC (C:\inetpub\wwwroot)path as an exception to Windows defender to resolve the issue
Please note: The ExtractedResources is not a folder coming with the installation. It is a working folder, where the client application unpacks bitmaps, and then IIS fetches it from there later on.
IIS needs to have permissions to write to it, the IIS_IUSRS account would require Read+Modify permissions for that folder.