What is service "ismserver" listening on port 9500?

I am on Ubuntu 16.04

Upon nmap -sV localhost, I came upon the output line 9500/tcp filtered ismserver which I cannot recognize.

The service ismserver listening on the port matches the IANA record, as seen on http://www.adminsub.net/tcp-udp-port-finder/ismserver

That nmap reports the port as filtered probably also reflects the fact that I have denied incoming traffic on that port.

Yet, I am interested in what exactly is the service listening on the port, what it is doing, and how to disable it if possible.

May I ask if anyone might have some ideas?

Thanks heaps!

PS

1. locate ismserver returns no result.

2. Found something with similar name, but unsure if relevant: http://www.netplex-tech.com/docs/netvigil/v3.6/NetVigil%20Manual%20v3.6-19-1.html

Nothing is listening on that port. Nmap marks the port as filtered when it gets no response. This usually doesn't happen for localhost scans, but I suppose something could have been missed. The "ismserver" service name is retrieved from a services database lookup and has no relevance to any running service, because the state of the port is not open.