I have the same issue and have searched the forums and see many having the same issue - but no solution.
When at home on the same network, the slingplayer/box work fine.
If i try to connect at work (across town) it plays for a few seconds/minutes and then errors.
There was an error connecting to your Slingbox. Please try again. Do you want to retry? [Code:W211]
My uncle in Thailand was able to view with very few issues until a week or so ago.
He reported seeing a maintenace update on the Sling website, and now he too cannot stay connected for more than a few
seconds/minute before getting the same error.
The old (unsupported) Sling App acts the same way. No error message - just drops the connection.
Please - Sling Support... find out what is happening. It is totaly unusable like this!
I have reset the box several times! Your only response to this matter is "reset the box"
That doesn't fix it! Let's find out a common thread of those that are having this issue...
What information do you need to troubleshoot this?
I have the Slingbox Pro HD and an Apple Airport Extreme Router. Cable Modem.