Here is my customer's setup.
MII Connection in PCo is set to 12.1
Every once in a while they are getting am getting the following error
Error,xMIIMessageHandler,Unknown error.,"[severity = Fatal] Invalid MII version
at SAP.Manufacturing.Connectivity.MIIDestination.ExecuteUrlPost(String currentUrl, String content, Boolean loggingIn, Boolean useTextXmlContentType)
at SAP.Manufacturing.Connectivity.MIIDestination.XMIIPingTimerCallback(Object state)"
When this happens, the Agent instance stops and manually has to be restarted. It also seems to affect every Agent I have set up on this PCo. (I have seperate Agents, one dedicated for MII queries, another dedicated to notifications.
This error occurs sporadically with no warning.