Hi, sorry i don't have a solution for you, but i can tell you I am having the exact same problem and I use the same Linksys ea8500 router for my home WiFi. Like you, I can also connect to my Slingbox 350 with both my PC's using LAN. However, I cannot connect with my Android phone or tablet using the same LAN connection. I get the same error to make sure both devices are connected to the internet. Also, (same as you described) I can connect to my Slingbox with my Android using LTE as long as I turn my WiFi off.
I'm not really sure what to do either. I already factory reset my Slingbox and went through the setup progress again. I've also restarted my modem, router, phone, and reinstalled the Android app multiple times. If I find a solution first, I will be happy to share it with you. Otherwise, I will keep checking back. Good luck!
Thanks, I also went through the various resets with no success. I just wish there was some log or error information that was truly helpful. While my Macbook is using wireless in my house I can successfully access my Western Digital NAS storage, which is on my LAN. I can also access a Canon wireless printer with no problem. So my Macbook, even when using a wireless connection, can access other devices, no matter if the devices are hard wired or wireless, it just an issue for Slingbox.
I don't have a clue whether this would matter for compatibility, but I believe the Linksys EA8500 is the first Linksys router to support MU-MIMO. Apparently the router is also known as Linksys Max-Stream AC2600 MU-MIMO Gigabit Router. As far as I can tell this feature should not impact the interface, but I really don't know, but given it is the first router of its kind, at least for Linksys, it is something to question.
One additional odd behavior, I connected to each of my Slingboxes while connected to the LAN, while my wireless was on, then once connected, I disconnected the LAN cable, but play continued. So clearly wireless can work, but it needs the LAN to establish the initial connection. I still don't know what the real issue is.
Well, I encountered this issue tonight, and solved it.
Here's what I did.
Set up static DHCP address for Slingbox.
Opened port 5001.
This still gave the same error.
I then put the Slingbox's IP in the DMZ.
Still gave the same error.
I then enabled the "Media Prioritization" setting for the Slingbox's IP.
Boom. Working via the internet and my LAN. Working via WIFI through the EA8500.
Hope it works for you.
I have just installed a new LinkSys EA8500 router in my home. I have two Pro-HD sling boxes, but the problem I am going to describe is the same if I take one of the boxes out of service. I can successfully connect to either Slingbox using a Macbook over a local LAN connection, or via iPhone 5 using SlingPlayer over LTE, as long as I have WiFi turned off the device I am using.
If I turn on WiFi on either the Macbook or iPhone 5, I cannot connect to either Slingbox. I can get to other things in my house and the internet with either device, so it seems the issue is Slingbox specific. I am not connecting to a guest network. I can successfully ping both Slingboxes from my Macbook. Each Slingbox is on a different port, I can make a successful telnet connection to the respective IP/port combination from my Macbook.
When WiFi is on, all I get on my Macbook is a popup that says "There is an error connecting to your Slingbox. Please try again." and a button to "Reconnect", which just cause the popup to reappear. On your my iPhone 5, I get a popup that says, "Slingplayer cannot connect to Slingbox. Please make sure your phone and Slingbox are connected to the internet and try again (8)".
Any suggestions or error logs I can look at to try and diagnose what is preventing the connection?