Tomcat Connection closed

Hi
how can do why a process closed a connection?

[root@SRV01 ~]# lsof -i tcp:8080
COMMAND  PID   USER   FD   TYPE   DEVICE SIZE NODE NAME
java    5851 tomcat   29u  IPv6 73216185       TCP *:webcache (LISTEN)
[root@SRV01 ~]# telnet localhost 8080
Trying 127.0.0.1...
Connected to localhost.localdomain (127.0.0.1).
Escape character is '^]'.
Connection closed by foreign host.

after some connects the tomcat don't response to any others request.
i'm trying with strace, but without any result

[root@SRV01 ~]# strace -p 5851
Process 5851 attached - interrupt to quit
futex(0xb742dbd8, FUTEX_WAIT, 5853, NULL

any idea? how can i do?
thanks a lot.
Cheers,
Lain