I had setup netflow on our Cisco ASA and directed traffic to the PRTG server over UDP 2055. The sensor was up and running for about five minutes, then it alarmed with the following error:
"Could not bind socket. Address and Port are already in use."
I have verified that the ASA is sounding packets with no errors using "sh flow-export counters" command. Running debug I do not see any errors on the ASA itself.
I took a quick look at the forums and I did read that a reboot of the PRTG server may be necessary. I would like to avoid that if possible, we have about 3000 sensors running with no problems, it is just the Netflow sensor that is throwing the error.