= doc.FAQ.HowCanIDetermineWhichPortsTheMulti-TierRequestBrokerUses

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The Request Broker port appears in the Session Rules Book. This is the oplrqb.ini file that appears in the /bin sub-directory of the user's server components installation. Users need to open this file with a text editor and locate the following section: 

{{{
[Protocol TCP] PingWatchdog = No PingInterval = 600 Listen = 5000 PortLow = 5000 PortHigh = 5099 IPAddress = 127.0.0.1 
}}}

 [[OpenLink]]  's 4.x and 5.x Brokers listen on the port passed by the Listen parameter. [[OpenLink]]  's 1.x and 3.x Brokers listen on the initial port as specified by the [[PortLow]]  parameter. 


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