Is 192.168.28.201 your ePO server? In the environments I've worked in, the IP here equals that of the ePO server.
On 192.168.28.201 does netstat -an show that port 8731 is listening on anything?
Is there a host based firewall on 192.168.28.201 that might be preventing that workstation from connecting on port 8731?
If you telnet from that workstation to 192.168.28.201 8731 ... do you get a connection, or is there an intervening firewall blocking you perhaps?
That this service/app uses WCF is a pain no doubt. In the environment I work in, they had to pull the ePO into the workstation domain in order to satisfy authentication requirements, but I suppose I should be relieved that there were no firewalls or ACL's to deal with regarding port 8731. Good luck!