When does F5FltSrv use port 8090?

I'm developing an application that runs on port 8090, but today it failed to start because the port was already in use by another process. I tried to find out what that process was and I got the following result (the command was executed in Windows PowerShell):

C:\Users\Alexander> Get-Process -Id (Get-NetTCPConnection -LocalPort 8090).OwningProcess

Handles  NPM(K)    PM(K)      WS(K)     CPU(s)     Id  SI ProcessName
-------  ------    -----      -----     ------     --  -- -----------
    138     162     3404       6204              6108   0 F5FltSrv

I read the Overview of ports used by the BIG-IP Edge Client for Windows article, but 8090 wasn't listed there. I then restarted my computer and suddenly the port was no longer in use and I could start my application without any problems. My question is: Is there some random port allocation going on? When does the F5FltSrv process use the 8090 port?