After installing MailEssentials or MailSecurity on a WebMonitor machine, the WebMonitor MSMQ queues are not processed anymore. The WebMonitor reporting stops working and after a while, the mail flow will stop.
Under Computer Management > Services and Applications > Message Queuing > Private Queues, you will find a very high number of items under gfiwonmidqueue@*.
'Access Monitoring' in the GUI (graphic user interface) does not show any current data. The DBCore.log file will contain the following error:
Type mismatch. (Exception from HRESULT: 0x80020005 (DISP_E_TYPEMISMATCH))
- Navigate to Start > Run > cmd.
- Go to the WebMonitor installation folder.