This is more like this forum: http://community.qlik.com/community/deployment?view=discussions&start=0
but I don't think this is a problem.
I haven't seen this message on the accesspoint but I saw it at QMC.
In my case, I believe that when the server is busy in a very heavy load, it takes longer to answer QMC and it triggers some kind of timeout.
In my case, the messages were just anoying.
So, I also want to understand? Is it just a timeout? Can it be adjusted to avoid the message ?