Q. After connecting DVR to client and selecting a picture, a picture doesn't show up
     but a message "R"
A.  Pictures turn up only when the versions of DVR program and Client program are the same.

      When you change the network port from DVR, you should change the port in Client program likewise.

      If you use an IP in an environment where DVR is installed,
      you should set up a port-forwarding function or DMZ at IP setting.
      Check the condition of media port(7076) when you use port-forwarding.