Troubleshooting: internal communication error following installation - Industrial IoT

Industrial IoT Plugin Guide

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Industrial IoT
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Guides > Plugin and extension guides
Industrial IoT

Following the installation of the Modbus plugin or a third-party software on the server, the plugin role is yellow and you receive the following message: Internal communication error. Connection to gateway has been lost.


The gateway of the plugin is unable to communicate with RabbitMQ, or RabbitMQ is unreachable.

Solution 1: In Windows, set the HOMEDRIVE environment variable to the drive on which the plugin is installed, and then restart the server.

Solution 2: Disable all network interfaces other than the main network interface of the server and restart server.

Solution 3: Verify that Microsoft Visual C++ 2013 x86 Redistributable is present on the server. If not, install it, and then restart the server.

Solution 4: Verify that RabbitMQ ports are not in use.

Solution 5: For the SNMP plugin, verify that port 162 is not in use by the server.