Troubleshooting: internal communication error following installation - Modbus 4.1

Modbus Plugin Guide 4.1

Modbus 4.1

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.


Rabbit MQ is not starting, which results in ports 5671 and 5672 remaining closed.


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