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1. On the Server, set the port range of ports for operation and the router's public IP address (see Network settings utility)for operation. By default, the base port is 20111, and the port range is 20111-20210 (see Ports used by the Axxon One Software Package).

2. Open the port range 57000–60000 on the Server (see Ports used by the Axxon One Software Package).
   

   Note
   title Attention!
   If you do not open the port range 57000–60000 on the Server, there will be a problem with receiving the events to the Client from the Server. To solve the problem, create the NGP_POLL_EVENTS system variable on the Client and set its value to 1 (see Appendix 10. Creating system variable).

   
   

3. Set the router public IP address (see Network settings utility).

   Note
   title Attention!
   The router's The router public IP address should be static.

   

4. On the router, forward the specified Server ports and the gRPC API 20109 port.

5. Launch the Client and specify the router 's external IP address and the Server 's external base port in the connection settings (see Starting an Axxon One Client).
   

   Note
   title Attention!
   When connecting the Client from an external network, only those Servers that have access to the external network will be available in the Axxon domain configuration (see Consolidating the Servers from different networks into Axxon domain).
   Note
   title Attention!
   In some cases, in security systems with a complex architecture (NAT, VPN), the Client may not receive events from the Server. To fix this, it is necessary to create the system variable NGP_POLL_EVENTS and set the 1 value to it (see Appendix 10. Creating system variable).

   
   

   Note
   title Attention!
   In a failover system, it is not possible to connect to the node that is behind NAT (see Connecting to a Node and Configuring of an Axxon domain).

   
   

Example:.

To connect the Client to the Servers behind NAT, do the following:

1. On the Server 1, set the port range 20111-20210 and the router public IP address of the router.
2. On the Server 2, set the port the port range 20211-20310 and the router public IP address of the router.
3. On the Server 3, set the port the port range 20311-20410 and the router public IP address of the router.
4. On the Server 1, 2 and 3, open the port range 57000–60000 and create the NGP_POLL_EVENTS system variable on the Client.
5. On the router, configure the forwarding of:
   1. the The router ports 20111-20210 to the internal IP address of the Server 1 and ports 20111-20210;.
   2. the The router ports 20211-20310 to the internal IP address of the Server 2 and ports 20211-20310;.
   3. the The router ports 20311-20410 to the internal IP address of the Server 3 and ports 20311-20410;.
   4. the The gRPC API 20109 port (always static) to the internal IP addresses of the Server 1, 2 and 3.
6. When connecting the Client, enter the router 's public IP address and port:
   1. port 20111 to connect to the Server 1;.
   2. port 20211 to connect to the Server 2;.
   3. port 20311 to connect to the Server 3.