AB CompactLogix 5069-L310ERS2/B connection via VPN fails

[baravovan]

Problem description

Hi

Have to mention that It works fine if I am staying in the same subnetwork with a PLC (tried Node-Red with the same PLC locally).

The problem occurs if I am trying to connect to the PLC using a VPN.
At start I received
"Error connecting to PLC: Error: TIMEOUT occurred while reading Controller Props.".

I tried to fix It using the steps provided here - issue 10.
After commenting the line 125 in the file "....node-red\node_modules\ethernet-ip\src\controller\index.js" It was changed to the
"Error communicating with the PLC: Error: <SCAN_GROUP> TIMEOUT occurred while writing Reading Tag Group.".

Changing timeout to 5056 in the file "....node-red\node_modules\ethernet-ip\src\enip\cip\unconnected-send\index.js" line 54 doesn't solve the problem.

Environment

• Node Version: v20.12.0
• Operating System and version: Windows 10
• Controller Type: 5069-L310ERS2/B
• Controller Firmware: 33.011
• VPN client: Ecatcher