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# Hardware Load Balancer, Multiple Machines

You can use a hardware load balancer as the front end of a PPM Server cluster configuration. A hardware load balancer is similar to an HTTP reverse-proxy server and forwards HTTP requests.

All PPM Servers in a server cluster must listen for HTTP requests on a unique port. Each server in the cluster must have its `HTTP_PORT` parameter set to a unique value that does not conflict with other external applications. You specify this parameter value for all servers in a cluster in the `@node` section of the `server.conf` file.

Note: Sticky sessions are required for hardware load balancing in the OpenText PPM environment.

https://admhelp.microfocus.com PPM 8942
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