I was getting exactly that error too: Connection reset by peer. The exception was being raised by Spring's REST template upon running the postForObject() method. For me the problem was too long HTTP URL request. So first check whether the URL produced is what it should be and, if your server really should be able to handle requests of that length, simply go to server's configuration and raise the default allowed length of URL requests.
That solved the problem for me, but be aware: the application might not run on some internet browsers, especially old ones, as they have fixed max length of URL requests.
Hope it helps...
