I have a similar case, did you find any solution to the issue?
I have 2 publishers nodes, on the main node the EDX works OK. In the second node it gives me error .
The task from two nodes have fisical files in the fisrt node. All the task run ok, except the edx inthe second node.
Port 4799 is open on both computers.
We were able to resolve our issue by installing Kerberos on the source Linux system that we were trying to make the call from. This allowed us to properly pass the Domain and User account that had the proper permissions to run the executable. The problem we had noticed was that the executable was trying to run as the local admin of the source system, rather than the local admin of the target server. Our scenario was a bit different, since we were not running the EDX trigger, but instead running a third-party application that was making an API call to Qlik to import Publisher Tasks from one server to another. However, The error we were originally receiving was the same as the one in this thread, so it may or may not work for you. Good luck!