This is the line to add to your cgminer.conf:
"api-allow":"W:127.0.0.1,W:192.168.1.0/24"
Of course this works for 192.168.1.0 LAN, change it for yours
If you are still in trouble please give us your conf file to look at.
I was preparing to post my conf files and as a precaution updated per your last post, Because I'm getting the spinning wheels after adding the S2. Note when only the local GridSeed gs3355 is configured Minera works fine.
After updating I added the S2. Spinning wheels as expected. But checked MobileMiner and the S2 is there and reporting correctly. So Minera must see it but not reporting stat's correctly.
What can I provide you with to help improve this already amazing system?