btw: it would be great if it was possible to restrict ui access, I only want the miner to be accessible from one (or more) ips... would appreciate if bitmain tech could add this feature in a future firmware upgrade 
Well, it happened! All of my S4+ (6 in total) have been hijacked...
I have different passwords for each device, and they are bulletproof... I've read some posts here and it seems that the developers of cgminer have reported that this will happend to bitmaintech but they didn't care... Even KNC Miner Neptune can restrict access to specific IPs... Seems like the only solution is to put the devices behind a firewall, which is a bit annoying, as the solution would be so easy!
Why can I not access the device by ssh and adjust cgminer api? It keeps telling me access denied (on all devices), altough password is correct for sure... Is there some kinda default user/password for ssh?
Thanks for your help