Hi Everyone, 

I am hoping you can help as i am totally at a loss here!

To give you an overview - I have 2 sites connected via a Manual IPSec Tunnel using the ER605.   The Software based controller is sitting at Site A and manages the Router at both sites along with a couple of Access Points.

Problem:   I am unable to upgrade the firmware at the remote site to the latest version (2.2.3) from 2.1.2.   I have gone through all of TP-LINK's online documentation and have port forwarded TCP/UDP 8043 and 29810 - 29816 through to the controller.   The progress bar gets to about 99% sits for a while and then proceeds to re-send the upgrade file.   Eventually it fails the upgrade and returns back to it's previous firmware version.

Using the onsite Windows Server there, i can confirm that i am able to telnet into the Controllers 8043 port from the other side so i am not sure as to what is going on to be totally honest.   I would love some pointers as to where i may have gone wrong with this as it is driving me nuts :-) 

Thanks!