If your PRTG probe lives in VLAN 10 and your target device lives in VLAN 20, a router or Layer 3 switch is required. If the router ACLs (Access Control Lists) or routing tables are misconfigured, the UDP packet drops silently.
To never see Error 2003 again, implement these standards: paessler snmp error 2003
section, increase the timeout from the default (usually 5 seconds) to 10 or 15 seconds. SNMP Delay : For "shaky" devices, try adding a small SNMP Delay or enabling "Use Single Get" SNMP Compatibility Options to reduce the load on the device's CPU. 3. Verify Device-Side SNMP Configuration Solved: SNMP not working server 2003 - Experts Exchange If your PRTG probe lives in VLAN 10
| Cause | Fix | |-------|-----| | Firewall blocking UDP/161 | Allow UDP 161 inbound on target, outbound on tester. | | Wrong SNMP port | Change port in device settings (e.g., to 1610). | | Source IP not allowed in SNMP ACL | Add Paessler probe IP to allowed managers. | | Community mismatch (silent drop) | Correct community string. | | Timeout too short | Increase SNMP timeout to 5000 ms in Paessler sensor settings. | | Device overloaded | Reduce polling frequency. | | Asymmetric routing | Ensure return path allows UDP from target to probe. | SNMP Delay : For "shaky" devices, try adding
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