Configure NLB

Overview

Microsoft Network Load Balancing (NLB) can be used to configure multiple web servers for high availability and load distribution in AVEVA Work Tasks Enterprise Console deployments.

In this setup, multiple web servers are grouped into an NLB cluster and exposed through a single virtual IP address or URL. Incoming requests are distributed across the available servers.

For redundancy, NLB (or ARR) can be used as a recommended approach.

Logical architecture (Example configuration)

In a typical deployment, AVEVA Work Tasks can be configured with multiple web servers for redundancy using Network Load Balancing (NLB).

A common setup includes:

• Two engine servers

• Two web servers configured in an NLB cluster

• One database server

This architecture can be extended to include additional components such as SMS Server or License Server, based on deployment requirements.

Prerequisites

Before configuring NLB:

• Each web server must have: Static IP addresses

• Two network adapters (NICs) configured (as required by the environment)

• Windows Network Load Balancing feature must be installed

• Servers must be reachable within the same network

Install and configure NLB

For detailed steps on configuring Windows Network Load Balancing, refer to Achieving High Availability and Scalability - ARR and NLB.

Important: Configuring NLB requires knowledge of Microsoft NLB architecture, including network configuration, port management, and cluster setup. It is recommended that NLB configuration be performed by personnel familiar with these concepts.

Limitations

Web API calls initiated from the user interface may not complete successfully if a server becomes unavailable

Certificate requirements for NLB

Use certificates provided by IT

If your IT department provides the certificates, ensure that the certificates are installed in the appropriate certificate stores on the local machine.

• Import the root certificate into the Local Computer Trusted Root Certification Authorities store

• Import the intermediate certificate into the Local Computer Intermediate Certification Authorities store

• Import the SSL certificate into the Local Computer Personal store

Certificates storage requirements

SSL certificate requirements

Note: If you are using certificates provided by your IT team, ensure that Microsoft guidelines for certificate creation and installation are followed. The certificate must include the common NLB URL as part of the certificate request.