# Unable to find device

**URL:** <https://forum.elastiflow.com/t/unable-to-find-device/311>\
**Category:** ElastiFlow Community\
**Created:** [July 16, 2025, 2:14am UTC](https://forum.elastiflow.com/t/unable-to-find-device/311 "2025-07-16T02:14:56Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![banjo](https://avatars.discourse-cdn.com/v4/letter/b/7cd45c/32.png) [@banjo](https://forum.elastiflow.com/u/banjo)\
**Post date:** [July 16, 2025, 2:14am UTC](https://forum.elastiflow.com/t/unable-to-find-device/311/1 "2025-07-16T02:14:56Z")

</div>

Has anyone figure out yet what the root cause of this issue? I can snmpwalk on my cisco device and this is my devices.yml

```auto
enterprise:
  ip: 10.1.0.10
  port: 161
  version: 2c
  communities:
    - public
  device_groups:
    - cisco_generic

```

ERROR

```auto
Jul 16 14:12:49 elastiflow snmpcoll[9695]: {"level":"error","ts":"2025-07-16T14:12:49.080+1200","logger":"snmpcoll.snmp.controller","caller":"controller/controller.go:302","msg":"unable to find device details","ip":"10.1.0.10","port":161,"stacktrace":"github.com/elastiflow/flowcoll/pkg/inputs/snmp/controller.applyControlSignalDeviceAdd\n\t/tmp/collectors/pkg/inputs/snmp/controller/controller.go:302\ngithub.com/elastiflow/flowcoll/pkg/inputs/snmp/controller.(*Controller).handleControlStream\n\t/tmp/collectors/pkg/inputs/snmp/controller/controller.go:280\ngithub.com/elastiflow/flowcoll/pkg/inputs/snmp/controller.(*Controller).Run\n\t/tmp/collectors/pkg/inputs/snmp/controller/controller.go:186"}
Jul 16 14:12:49 elastiflow snmpcoll[9695]: panic: runtime error: invalid memory address or nil pointer dereference
Jul 16 14:12:49 elastiflow snmpcoll[9695]: [signal SIGSEGV: segmentation violation code=0x1 addr=0x9c pc=0xb4daf7]
Jul 16 14:12:49 elastiflow snmpcoll[9695]: goroutine 163 [running]:
Jul 16 14:12:49 elastiflow snmpcoll[9695]: github.com/elastiflow/flowcoll/pkg/inputs/snmp/opmanager.(*OpManager).forwardOperationsForDevice(0xc0015364d0, {0x20fdfb0, 0xc0015ec000}, 0xc0025a0c60, {{0xc0016a01e2, 0x9}, 0xa1}, 0xc0020ae000)
Jul 16 14:12:49 elastiflow snmpcoll[9695]: /tmp/collectors/pkg/inputs/snmp/opmanager/opmanager.go:150 +0x237
Jul 16 14:12:49 elastiflow snmpcoll[9695]: created by github.com/elastiflow/flowcoll/pkg/inputs/snmp/opmanager.(*OpManager).captureControlSignal in goroutine 137
Jul 16 14:12:49 elastiflow snmpcoll[9695]: /tmp/collectors/pkg/inputs/snmp/opmanager/opmanager.go:119 +0x6d6
Jul 16 14:12:49 elastiflow systemd[1]: snmpcoll.service: Main process exited, code=exited, status=2/INVALIDARGUMENT
Jul 16 14:12:49 elastiflow systemd[1]: snmpcoll.service: Failed with result 'exit-code'.
Jul 16 14:12:49 elastiflow systemd[1]: snmpcoll.service: Consumed 2.168s CPU time.
Jul 16 14:12:49 elastiflow systemd[1]: snmpcoll.service: Scheduled restart job, restart counter is at 2.
Jul 16 14:12:49 elastiflow systemd[1]: Stopped ElastiFlow SNMP Collector.
Jul 16 14:12:49 elastiflow systemd[1]: snmpcoll.service: Consumed 2.168s CPU time.
Jul 16 14:12:49 elastiflow systemd[1]: Started ElastiFlow SNMP Collector.

```

```auto
iso.3.6.1.2.1.1.2.0 = OID: iso.3.6.1.4.1.9.1.1041
iso.3.6.1.2.1.1.3.0 = Timeticks: (1253077) 3:28:50.77
iso.3.6.1.2.1.1.4.0 = STRING: "\"admin@yourcompany.com\""
iso.3.6.1.2.1.1.5.0 = STRING: "Management-Router"
iso.3.6.1.2.1.1.6.0 = STRING: "\"Your Data Center\""
iso.3.6.1.2.1.1.7.0 = INTEGER: 78
iso.3.6.1.2.1.1.8.0 = Timeticks: (0) 0:00:00.00
iso.3.6.1.2.1.1.9.1.2.1 = OID: iso.3.6.1.4.1.9.7.129

```

---

<div class="post-metadata">

**Author:** ![banjo](https://avatars.discourse-cdn.com/v4/letter/b/7cd45c/32.png) [@banjo](https://forum.elastiflow.com/u/banjo)\
**Post date:** [July 16, 2025, 2:33am UTC](https://forum.elastiflow.com/t/unable-to-find-device/311/2 "2025-07-16T02:33:02Z")

</div>

Here’s the fix which I found from another post

`rm -rf /usr/share/elastiflow/snmpcoll/*.gob`

---

<div class="post-metadata">

**Author:** ![daniel.harada](https://avatars.discourse-cdn.com/v4/letter/d/d6d6ee/32.png) [@daniel.harada](https://forum.elastiflow.com/u/daniel.harada)\
**Post date:** [July 16, 2025, 12:19pm UTC](https://forum.elastiflow.com/t/unable-to-find-device/311/3 "2025-07-16T12:19:14Z")

</div>

Glad you found a fix!

We will be making some changes around the “persist” feature that creates that object file.

Regards,  
Dexter Turner

---

<div class="post-metadata">

**Author:** ![system](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.elastiflow.com/system/32/59_2.png) [@system](https://forum.elastiflow.com/u/system)\
**Post date:** [August 15, 2025, 12:19pm UTC](https://forum.elastiflow.com/t/unable-to-find-device/311/4 "2025-08-15T12:19:42Z")

</div>

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