> Source: [sk170993](https://support.checkpoint.com/results/sk/sk170993)

# sk170993 - SNMP v3 users are not recognized on VSX when SNMP is in VS mode

| Property | Value |
|----------|-------|
| Solution ID | sk170993 |
| Date Created | 2020-12-17 |
| Last Modified | 2021-07-08 |
| Technical Level | General |
| Products | Security Gateway |
| Versions | R81.10 (EOS), R81 (EOS) |

## Symptoms

- * After upgrade, the `snmpwalk` command fails with "`snmpwalk: Unknown user name`" or "`snmpwalk: Timeout`" errors on VSX when SNMP is in VS mode.
* Deleting and adding the USM user again does not help

## Cause

A different function writes changes to SNMP configuration file in r80.40 and R81 compared to previous versions.   
In some rare scenarios, this function leads to corruption of */var/lib/net-snmp/snmpd.conf* file due to multiple instances of SNMPD updating the file when running in VS mode.

## Solution

This problem was fixed. The fix is included in:

* [Check Point R81.10](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk170416)
* [Jumbo Hotfix Accumulator for R81](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk170114) starting from Take 13
* [Jumbo Hotfix Accumulator for R80.40](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk165456) starting from Take 91

If you choose not to upgrade, Check Point can supply a **Hotfix** . [Contact Check Point Support](https://www.checkpoint.com/support-services/contact-support/) to get a Hotfix for this issue.  
A Support Engineer will make sure the Hotfix is compatible with your environment before providing the Hotfix.  
For faster resolution and verification, please collect [CPinfo files](http://supportcontent.checkpoint.com/solutions?id=sk92739) from the Security Management Server and Security Gateways involved in the case.

**Hotfix installation instructions:**   
Refer to [sk168597 - How to install a Hotfix](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk168597).

<br />

In some scenarios, users should be recreated after disabling VS mode to resolve the issue:

1. Install the hotfix
2. Delete all snmp users:  
   *\>delete snmp usm user \<username\>*
3. Set the SNMP mode to default:  
   *\>set snmp mode default*
4. Add SNMP users again:  
   *\>add snmp usm user \<username\> security-level \<Auth-privilege\>*
5. Change the SNMP mode to VS:  
   *\>set snmp mode vs*

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