OK,

 Honestly I hate to sound angry but I've been working this problem for almost two months now.  Here is my set up.

 I have a Slingbox SOLO connected to an Actiontec MI424-WR router provided by Verizon.  I get Verizon FIOS broadband service.  The slingbox is hooked up in New York...I'm currently living in London, UK and trying to connect remotely.

From the first time I tried to use the thing from here in London it streamed for 5 minutes at a time before freezing.  I looked around on the Slingcommunity boards and found a thread for this exact problem, with this exact router and FIOS.....I tried all the listed "solutions" and none of them worked.  Now for some reason I can't connect at all and I get the classic Slingbox error message about checking to see if the slingbox is turned on and not blocked by Firewall/NAT settings.

Based on the talks I've had with dozens of pissed off people on these boards...about 50% of all slingbox owners can't seem to get their slingboxes properly working.  I've sat online for hours with Slingbox tech support.....my brother back in the US has done the same, and also spent time on the phone with Verizon.

Basically....with the time we've both put in trying to get my slingbox working for remote viewing we could have planned a deep space mission by now.  And the most annoying part is that every single person at Slingbox tech support seems to know LESS about fixing this stuff than I do.  And I don't know very much at all!   Plus I've never recieved anything approaching an explanation as to WHY my 180 dollar shiny new slingbox is basically functioning as a paperweight.   

Granted...everything electronic has problems but I can't believe the sheer volume of Slingbox owners who can't get their boxes working!  Plus, the main attitude I've gotten from Slingbox Tech Support is...."hey we already got your money so f**k off"   I really don't know what else to do....almost 2 months screwing around with this and no solution in sight...I DON'T EVEN KNOW WHAT THE PROBLEM IS!