> Source: [sk168192](https://support.checkpoint.com/results/sk/sk168192)

# sk168192 - SNMP traffic drops with "violated unidirectional connection" log

| Property | Value |
|----------|-------|
| Solution ID | sk168192 |
| Date Created | 2020-08-17 |
| Last Modified | 2021-01-21 |
| Technical Level | Advanced |
| Products | Security Gateway |
| Versions | R81 (EOS) |

## Symptoms

- * SNMP traffic drops with "`violated unidirectional connection`" log in SmartLog on UDP port 161.

* Kernel debug (`fw ctl zdebug + drop`) shows these drops for UDP port 161:  
  "`dropped by fw_one_way_enforcement Reason: conn oneway violated`"

* The Application Control policy has service objects "snmp-trap-Protocol-Signature" and "snmp-Protocol-Signature" configured to match "Any" port.

## Solution

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