I purchased a slingbox from someone on eBay it didn't include the IR connection.
I am able to connect to the slingbox within the same network using the App and browser but only on the channels that the TV is already on. If someone at the TV changes the channel on the topset it changes the remote viewers channel too. Using the App or browser, I'm not able to change the channel or even get video or audio unless the topset box is on and someone already watching TV.
Is this because I'm missing the IR cable?
If so, I assume I can buy this online somewhere.
If this is unrelated, how can I fix this?
Thanks in advance.
Yes, you'll need to get a compatible IR cable for the Slingbox SOLO. The newer boxes (350, 500, M1/M2) have built-in IR emitters. You can buy the IR emitter on the Slingbox accessory page: Slingbox.com - Buy Slingbox Accessories
When you get this and you find a compatible remote, you should be able to your set-top box on/off and change channels.