Error: <SNMP-3-AUTHFAIL: Authentication Failure for SNMP>

Overview

This article describes the issue when UDT polls Cisco Switches and you receive the following error: 

<SNMP-3-AUTHFAIL: Authentication Failure for SNMP >

Environment

• All versions of UDT
• Layer 2 device being polled for Layer 3 statistics and VRF context polling when these devices do not support the technology

Resolution

Disable VRF and Layer 3 polling using the Orion Web Console

1. On the Orion Console, go to Settings > Manage nodes.
2. Find the node, highlight it, and then select edit.
3. Browse to the bottom of the page and untick the box next to Poll Layer 3 data from device.  
4. Tick the box next to Disable VRF context polling.

Perform the following using SQL commands from the database (NPM 11.5.x only):

1. Find the Nodeid

   1. Start > All Programs > Solarwinds Orion > Advanced Features > Database Manager > Add Default Server>

      Expand the NPM Database (default )NetPerfmon.

   2. Right-click the database name > Select New Query.

   3. Select nodeid form nodesdata where caption name = <NodeCaption>

Where <Node Caption> is the node caption of the node you want to modify.

2. Disable context polling:
   1. Right-click the database name > Select New Query.
   2. UPDATE UDT_NODECAPABILITY SET CONTEXTPOLLINGDISABLED=0 where nodeid = '<Nodeid>'

where <NodeID> is the node id gathered earlier.

3. Disable Layer 3 polling:
   1. UPDATE UDT_NODECAPABILITY SET ENABLED=0 WHERE CAPABILITY=3 and  nodeid = '<Nodeid>'

where <NodeID> is the node id gathered earlier.