Hi again @Jorma_Tuomainen,
That one is unfortunately a bit of an annoying one and one that we have seen every now and then for a little while now . We never were able to find a reproducer, unfortunately, but it does appear to be reported to us most often after a system (not necessarily rockstor package) update.
In an attempt to get a better understanding, would you have any “customization” to your network settings (in Rockstor webUI)?
What is your current network setup in general: multiple NICs, bond/team, or any information you can think of?
In past reports, users seemed to indicate (sometimes) it would go away after a reboot; is that the case for you?
Would you have a way to make this error appear systematically on your system?