ESXi 5.0 repeating event user root logged in/out

Hi,

I have been dealing with ESXi hosts having problems with constantly repeating root logged in / logged out event. Every 10 seconds these events repeat:

User root@1.2.3.4 logged in  23.12.2012 23:29:59   
User root logged out 23.12.2012 23:30:16

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1.2.3.4 is my monitoring server's public IP address.

I always managed to drain it down to some monitoring software, which was guilty for these logs, but this time I cannot find the real suspect.

I have VEEAM monitoring installed, so I killed ALL Veeam services.
After that, I only see repeating every 10 seconds:

User root logged out 23.12.2012 23:31:26

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Ok, there must be something else.
I monitor TCP connections and I only see my Vsphere CLIENT connected to remote port 443, nothing else. If I close vSphere Client, all those 443 port TCP connections go away.

But I was using it fine for years now...and all of the sudden...here we have this annoying event again.
I am frustrated because this repeating event pushes out the IMPORTANT waringn about storage deterioration problem, which I hunt for - but if I have just those "root logged out" events all over, I cannot watch for realy importan event.

Any idea?