# "Error in packet" error on SNMP query to the DPLANE after an upgrade

**Product**: Maestro HyperScale Firewall, Security Gateways  
**Version**: R81.20  
**OS**: Gaia  
**Last Modified**: 2025-06-30

## Symptoms
- After an upgrade, an SNMP query to the DPLANE fails, for example:

```
[Expert@Lab1:mplane]# snmpwalk  -v 3 -l authPriv -u snmptest -a SHA512 -A vpn12345 -x AES256 -X
vpn12345 -n dplane localhost 1.3.6.1.2.1 | head -n 15

Error in packet.

Reason: authorizationError (access denied to that object)
```

## Cause
Missing configuration in the _/etc/snmpd/snmpd.conf_ file.

In a rare scenario, when the MDPS toggles during the upgrade, the MDPS is not updated in the file.

Example with missing configuration:

```
group    snmptest_group    usm    snmptest
access   snmptest_group    ""    usm    priv    exact    systemview    none    none
access   snmptest_group    ctxname_vsid1    usm    priv    exact    systemview    none    none
access    snmptest_group    vsid1    usm    priv    exact    systemview    none    none
```

Example of a good configuration:

```
group    snmptest_group  usm     snmptest
access  snmptest_group  ""      usm     priv    exact    systemview      none    none
access  snmptest_group  dplane  usm     priv    exact    systemview      none    none
access  snmptest_group  ctxname_vsid0   usm     priv    exact    systemview      none    none
access  snmptest_group  vsid0   usm     priv    exact    systemview      none    none
```

## Solution
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#### NOTE
This solution has been verified for the specific scenario, described by the combination of Product, Version and Symptoms. It may not work in other scenarios.

## Article Properties
**Access Level**: Advanced  
**Status**: Approved by TAC  
**Date Created**: 2025-02-18  
**Last Modified**: 2025-06-30