Hi Jeroen

I'm not able to tell you what exactly can cause the failure. I can tell you how to investigate it.

If you would try this and it occurs again, keep note of the time.

1. Could you see some kind of error/notice in the information events?
2. Did the Client logging show anything? (i.e. System Center/Logging -> tab pages "Cube" and "Communication").
3. Does the SLNet.txt log file give any clues?
4. Initiate an SLNet Client Test Tool follow when you reproduce the issue.
5. There aren't any RTE's on the system are there? (check SLWatchdog2.txt)

What might also help your investigation is:

• What's the DM version?
• is it a cluster/single DM?
• Zenoss is that an element?
• When was the last time you created a new property?
  In other words, what changed since last time?
• Do you get this wherever you try to create a property (i.e. any view, service, alarm, element) or is it isolated?

I hope this'll help you further 🙂