I had the same issue. I have a 4 port network switch behind the TV that I use to connect the SMART TV and other components, including the Slingbox 350. The 350 had an IP and appeared to be connected fine to the network. However, every time I tried to access it, the viewer hung, and after a few minutes, displayed Error 202 - poor network connection.
Well, I happened to have a 50 foot lan cable and connected the 350 directly to my Netgear router (i.e., bypassing the switch). After a reboot of the Slingbox, I was able to connect with no problem. I am no network guru and I would be curious if anyone else has seen this issue (error 202 when trying to connect through a switch) and has a theory why.
Dan, if you are not using a switch, I'm not sure what the problem may be. If you do, try a "direct connection" and see if it works for you, too.
I had mine connected directly to my router with about a 10 foot ethernet cable. I also had some troubles when I was running it through a switch using the same length cable.
I was able to get my Slingbox going again, I reset it back to factory defaults and then went in and redid all the settings. I'm happy to say everything works fine now!
Was really strange though as it was working fine and then just quit working mid-show. That's modern technology for you though, when it works it's great, when it doesn't it's a major pain in the A$$!