Configure Reverse Connect

Usually, a connection is opened by the client before starting the UA-specific handshake. However, this will fail when servers are behind firewalls with no open ports to connect to. In the reverse connectivity scenario, the server opens the connection and starts with a ReverseHello message requesting that the client establish a secure channel using this connection.
To use
Reverse Connect
, you should configure the connection in both FactoryTalk Linx Gateway and the OPC UA client.
IMPORTANT:
Changing the Max Connection to 1 may prevent client communication because some OPC UA clients require 2 connections to operate normally.
To configure Reverse Connect in FactoryTalk Linx Gateway
  1. In
    Endpoint Properties
    , select
    Enable reverse connect
    .
  2. Click
    Add
    .
  3. In
    Reverse Connect
    , enter the client URL.
    The URL must be in the format
    opc.tcp://hostname_or_ip:port/Endpoint
     where
    hostname_or_ip
     and
    port
     are replaced with the hostname or IP address and port number of the OPC UA client.
    Endpoint
     is optional. Do not use the port that is already occupied by other clients.
    Example: client IP=192.168.1.1, port number=4001, Client URL= opc.tcp://192.168.1.1:4001
  4. Select
    Save
    .
For more details about Reverse Connect, see Endpoints.
To configure Reverse Connect in UA Client (taking UaExpert as an example)
  1. In the
    Unified Automation UaExpert
     dialog box, click UaExpert Add server icon to add a server.
  2. In the
    Add Server
     dialog box, under
    Reverse Discovery
    , enter the URL that is the same URL entered in the
    Client URL
     box in FactoryTalk Linx Gateway.
  3. Click
    OK
    .
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