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TIBCO iProcess® Engine 11.9.1

# TCP and UDP Ports When Running Multiple Instances of the Director

When running multiple instances of TIBCO iProcess Objects Director, the `TCP_SERVICE_NAME` and `UDP_SERVICE_NAME` process attributes work somewhat differently than the other process attributes, as follows:

## TCP_SERVICE_NAME

The following is the process that TIBCO iProcess Objects Director goes through to establish a TCP port when it starts up:

| 1. | TIBCO iProcess Objects Director looks to see if an instance-specific `TCP_SERVICE_NAME` process attribute is defined for the instance of TIBCO iProcess Objects Director that is starting. For example, if instance 2 of TIBCO iProcess Objects Director is starting, it looks to see if `set_attribute` was executed for TCP_SERVICE_NAME using a `ProcInst` of 2. If an instance-specific TCP_SERVICE_NAME was defined, it uses the TCP port specified.

| 2. | If an instance-specific `TCP_SERVICE_NAME` process attribute has not been defined, TIBCO iProcess Objects Director looks to see if a “base” `TCP_SERVICE_NAME` process attribute has been defined (`set_attribute` was executed using a `ProcInst` of 0). If a base `TCP_SERVICE_NAME` process attribute has been defined, it adds the instance number (minus 1; because the base number is used by instance 1) to the base TCP port number to determine the TCP port for that TIBCO iProcess Objects Director (for example, if the base TCP port number is 10000, instance 3 of TIBCO iProcess Objects Director will use TCP port 10002).

| 3. | If neither the instance-specific nor the “base” `TCP_SERVICE_NAME` process attribute has been defined, it defaults to dynamic, causing the operating system to assign the port number when TIBCO iProcess Objects Director is started.

For more information about specifying the TCP port, see TCP_SERVICE_NAME process attribute.

## UDP_SERVICE_NAME

The following is the process a TIBCO iProcess Objects Director goes through to establish a UDP port when it starts up:

1. The TIBCO iProcess Objects Director looks to see if an instance-specific `UDP_SERVICE_NAME` process attribute is defined for the instance of TIBCO iProcess Objects Director that is starting. For example, if instance 2 of TIBCO iProcess Objects Director is starting, it looks to see if `set_attribute` was executed for `UDP_SERVICE_NAME` using a `ProcInst` of 2. If the instance-specific `UDP_SERVICE_NAME` was defined, it uses the UDP port specified (or if “None” is specified, no UDP port opens).

2. If an instance-specific `UDP_SERVICE_NAME` process attribute has not been defined, TIBCO iProcess Objects Director looks to see if a “base” `UDP_SERVICE_NAME` process attribute has been defined (`set_attribute` was executed using a `ProcInst` of 0). If a base `UDP_SERVICE_NAME` process attribute has been defined, it adds the instance number (minus 1; because the base number is used by instance 1) to the base UDP port number to determine the UDP port for that TIBCO iProcess Objects Director (for example, if the base UDP port is 55670, instance 3 of TIBCO iProcess Objects Director uses port number 55672).

3. If neither the instance-specific nor the “base” `UDP_SERVICE_NAME` process attribute has been defined, the first instance of TIBCO iProcess Objects Director is assigned port 28001 (the default for TIBCO iProcess Objects Directors), instance 2 is assigned 28002, and so on.

For more information about specifying the UDP port, see UDP_SERVICE_NAME process attribute.

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