APACHE做负载均衡时出错

apache http server2.0+weblogic92

配置信息:
<Location /BillWeb>
SetHandler weblogic-handler
WebLogicCluster 135.64.132.7:2012,135.64.132.7:2013
WLCookieName JSESSIONID-BILL
Debug ERR
WLLogFile /opt/hpws/apache/logs/bill_proxy.log
</Location>


错误日志如下:
Sat Oct 25 15:03:42 2008 <2423612249182202> request [/BillWeb/payacct.do] did NOT process sucessfully..................
Sat Oct 25 15:04:10 2008 <242361224918249135> Write to the browser failed: calling URL::close at line 673 of ap_proxy.cpp
Sat Oct 25 15:04:10 2008 <242361224918249135> *******Exception type [WRITE_ERROR_TO_CLIENT] raised at line 674 of ap_proxy.cpp
Sat Oct 25 15:04:10 2008 <242361224918249135> request [/BillWeb/payacct.do] did NOT process sucessfully..................
Sat Oct 25 15:04:11 2008 <242361224918249136> Write to the browser failed: calling URL::close at line 673 of ap_proxy.cpp
Sat Oct 25 15:04:11 2008 <242361224918249136> *******Exception type [WRITE_ERROR_TO_CLIENT] raised at line 674 of ap_proxy.cpp
Sat Oct 25 15:04:11 2008 <242361224918249136> request [/BillWeb/payacct.do] did NOT process sucessfully..................