I'm writing a simple JSONRPC server that is intended to have a number of longpolling http connections. 

-On the server side, I'm using txJSON-RPC and utilizing returning deferred (which translate into NOT_DONE_YET at the next layer). 

-On a clientside, I'm using JQuery to kick off a longpolling ajax POST to the rpc interface. 

Upon the requests arrival to the RPC server I returned a Deferred, adding it to my list. The POST should only return data (finish the request) once the server side has some changed state. It works for basic tests. 

However, once I increase the number of outstanding connections, I don't see any more connections accepted from my browser. I seem to be capped at 6 open connections. If I start a new browser, ie: chrome, or even change the URL from localhost to 127.0.0.1 I'm able to open another 6. 

I've never done much server programming so I'm a bit confused as to where to look to fix this. I've import pdb and set_trace() all the way down to the tcp.py part and I still don't see any activity coming in.

What steps should I take to identify and fix this limitation? Any help would be appreciated!

-Adam