Connection timed out at client side

[Spider84]

I wrote simple socket.io server and start it in DEBUG mode with Single Worker instance. Connecting to this server from WEB pages JS socket.io clients (5-10 clients at same time). All work fine if clients connecting with some intervar (minutes between connections). If all clients do connect in same time (~1-5 second between connections) server generate connection event but clients will disconnects with Connecting timedout error. Look like server work fine (not freeze, process data from SQL fine) but not accepting clients. After this I block clients by firewall, restart Workerman Daemon and then unblock clients by one. How to debug this issue? HELP!! :)