After one of the updates, we start getting retail server not connected error.
Once we login in offline mode, then we can come online using the settings inside MPOS.
But once we logout and then try to login again, we are not able to login in online mode.
When i checked into error logs in event viewer, then i get error on this link :
It says server is not available..
but once i login and choose online from the settings, then all the transactions are going online.