I was running PRTG on my local machine fine. Sflow was working fine. We moved it to a new server, fresh build 2012R2 since that move Sflow has stopped working. Either its not picking the data up at all or I am getting could not bind socket, address and port already in use. I did go into the routers and switches and repoint them to the new server. I have no explanation as to why this broke. If I can run 2200 monitors on my local win7 box, I didnt think I would have any issues with a much bigger server. Not sure what happened here.