NetFlow Replicator Port Already in Use

I had our Solarwinds admin install the NetFlow Replicator on the flow collector of Solarwinds. As he's trying to configure it, it says that for the Listener port of 2055 a message in red that says "This port is already used".

Any ideas on where to go with this message? Thanks!

SolarWinds solutions are rooted in our deep connection to our user base in the THWACK^© online community. More than 180,000 members are here to solve problems, share technology and best practices, and directly contribute to our product development process.