Article - CS378797
IOT Gateway fails communicating with error "MQTT agent <agentName> disconnected - reason 'null' " in PTC Kepware Products
Modified: 17-Jan-2025
Applies To
- Kepware Server (formerly KEPServerEX) 5.20.396.0 to 6.17
- ThingWorx Kepware Server (legacy) 8.0 to 6.17
Description
- IoT Gateway Agent with an MQTT Client Type connecting to Azure IoT Hub receiving "MQTT agent <agentName> disconnected - reason 'null'" error in event log
- Communication stops after some time after initially working fine
- Azure is closing the TCP socket after windows host of Kepware does a client key exchange / change cipher spec as part of SSL/TLS negotiation
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