Rick, I agree, it has to be some type of network issue. I have gone over all of the articles here in the networking areas that were posted also.
We have pictures at the DVR & CRT, the DVR is connected via a ethernet line from the trailer to the Linksys router which is then ethernet connected to the WildBlue Modem about 2' away.
The DVR has a FIXED IP address I assigned for it of 192.168.1.102 and never changes. I have port 50000 set up on the DVR to be the active port, and yes it is forwarded from the router to the IP address of the DVR.
Ken