# Modbus TCP devices intermittently disconnecting and reconnecting

**URL:** <https://forum.inductiveautomation.com/t/modbus-tcp-devices-intermittently-disconnecting-and-reconnecting/64541>\
**Category:** Ignition\
**Created:** [September 27, 2022, 3:39pm UTC](https://forum.inductiveautomation.com/t/modbus-tcp-devices-intermittently-disconnecting-and-reconnecting/64541 "2022-09-27T15:39:38Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Dustin\_Kwok](https://avatars.discourse-cdn.com/v4/letter/d/41988e/32.png) [@Dustin\_Kwok](https://forum.inductiveautomation.com/u/Dustin_Kwok)\
**Post date:** [September 27, 2022, 3:39pm UTC](https://forum.inductiveautomation.com/t/modbus-tcp-devices-intermittently-disconnecting-and-reconnecting/64541/1 "2022-09-27T15:39:38Z")

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Hi I am working with 3 Modbus TCP devices along with a handful of DNP3 devices. The 3 Modbus TCP would intermittently disconnect and reconnect causing countless alarms. Alarms seem to occur every couple minutes with random gaps (15-20 minutes) where everything seems fine. There are three alarms that seem to cycle for each device…

The alarms are as follows:

1. ReadHoldingRegistersRequest -  

2. SocketIODelegate  

3. TimeoutDaemon

Devices are all under one tag group \> Direct \> 1000ms \> subscribed

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**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\
**Post date:** [September 27, 2022, 3:46pm UTC](https://forum.inductiveautomation.com/t/modbus-tcp-devices-intermittently-disconnecting-and-reconnecting/64541/2 "2022-09-27T15:46:47Z")

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You will almost certainly need to collect wireshark captures focused on the problem devices, and start a support ticket. Those errors indicate **something** broke the TCP connnection between Ignition and the device.