Tomcat – mod_jk problem: Tomcat is probably not started or is listening on the wrong port

I am running some application on Tomcat 6.0.26. There is Apache in front of web server talking to it over mod_jk. Every few hours when I try to access application browser simply spins, and no content is retrieved.

No error is reported in Tomcat logs, but I fond such errors in mod_jk log:

[Sun Jul 04 21:19:13 2010][error] ajp_service::jk_ajp_common.c (1758): Error connecting to tomcat. Tomcat is probably not started or is listening on the wrong port. worker=***** failed
[Sun Jul 04 21:19:13 2010][info]  jk_handler::mod_jk.c (1985): Service error=0 for worker==*****
[Sun Jul 04 21:19:13 2010][info]  ajp_connection_tcp_get_message::jk_ajp_common.c (955): Tomcat has forced a connection close for socket 46
[Sun Jul 04 21:19:13 2010][info]  ajp_connection_tcp_get_message::jk_ajp_common.c (955): Tomcat has forced a connection close for socket 46
[Sun Jul 04 21:19:13 2010][info]  ajp_connection_tcp_get_message::jk_ajp_common.c (955): Tomcat has forced a connection close for socket 46
[Sun Jul 04 21:19:13 2010][error] ajp_get_reply::jk_ajp_common.c (1503): Tomcat is down or refused connection. No response has been sent to the client (yet)
[Sun Jul 04 21:19:13 2010][error] ajp_get_reply::jk_ajp_common.c (1503): Tomcat is down or refused connection. No response has been sent to the client (yet)
[Sun Jul 04 21:19:13 2010][info]  ajp_connection_tcp_get_message::jk_ajp_common.c (955): Tomcat has forced a connection close for socket 46
[Sun Jul 04 21:19:13 2010][error] ajp_get_reply::jk_ajp_common.c (1503): Tomcat is down or refused connection. No response has been sent to the client (yet)
[Sun Jul 04 21:19:13 2010][info]  ajp_connection_tcp_get_message::jk_ajp_common.c (955): Tomcat has forced a connection close for socket 45
[Sun Jul 04 21:19:13 2010][info]  ajp_connection_tcp_get_message::jk_ajp_common.c (955): Tomcat has forced a connection close for socket 46
[Sun Jul 04 21:19:13 2010][info]  ajp_service::jk_ajp_common.c (1721): Receiving from tomcat failed, recoverable operation attempt=0

my worker is configured in following way:

worker.admanagonode.port=8009
worker.admanagonode.host=*****.com
worker.admanagonode.type=ajp13
worker.admanagonode.ping_mode=A
worker.admanagonode.socket_timeout=60
worker.admanagonode.prepost_timeout=10000
worker.admanagonode.connect_timeout=10000
worker.admanagonode.connection_pool_size=200
worker.admanagonode.connection_pool_timeout=300
worker.admanagonode.retries=20
worker.admanagonode.socket_keepalive=1
worker.admanagonode.cachesize=10
worker.admanagonode.cache_timeout=600

Tomcat has same port number in Connector configuration:

<Connector port="8009" protocol="AJP/1.3" redirectPort="8443" address="*********" />

Does any of you has any ideas what i am missing? What can cause such problems?

Cheers
Konrad