BOSH only support 500 clients

xmpp.client.processing.threads
100
xmpp.httpbind.worker.threads
500

env:

strophe.js

Openfire

when BOSH clients more than 500, CPU and memory’s usage is very low, it will give me an error, the error log like this:

nginx

119.57.115.195 - - [16/Feb/2016:15:43:13 +0800] [0.000] [535] “POST /http-bind/ HTTP/1.1” 400 290 953 “-” “Mozilla/5.0 (Windows NT 6.1; WOW64; rv:43.0) Gecko/20100101 Firefox/43.0”

119.57.115.195 - - [16/Feb/2016:15:43:13 +0800] [0.000] [535] “POST /http-bind/ HTTP/1.1” 400 290 953 “-” “Mozilla/5.0 (Windows NT 6.1; WOW64; rv:43.0) Gecko/20100101 Firefox/43.0”

info.log

2016.02.16 15:42:17 org.jivesoftware.openfire.http.HttpBindServlet - Root element ‘body’ does not contain a SID attribute value in parsed request data from [127.0.0.1]

is the openfire server can not handle more than 500 clients?