Very likely an NCM issue. Go to Settings -> NCM Settings -> Node Inventory and Uncheck "Extend VLANS inventory option".
Hi Rob, Apologies for late reply - no this option is unchecked already. Thanks Damian
I've been working with SW support on this for close to 6 months and there is a fix on UDT 3.1.
I recommend you install the update and then select all devices that generate the error, go into "edit node".
Under UDT Node Properties, you'll see the option "Disable VRF context polling"
Select it and it should clear your issue.
If you still see messages, then you could have a different issue, but if its the VRF query, it will fix it.
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Thanks for the answer - looks like we did strike this problem as well as another one which we discovered last night.
If a VLAN is in a status of suspended the same authentication failure trap will be sent by the switch, and the SNMP query will time out.
SW are going to do a fix for this but in the meantime we'll be hopefully removing the suspended VLAN from our VTP domain.