ldirectord: active sessions on a dead server weighted 0

Greetings folks,

I am hoping someone here could give me advice on an issue I am having  
with ldirectord.  I am load balancing between two apache servers,  
works great except when one server goes down ipvsadm still shows  
active sessions on it even though the weight is dropped down to 0.   
When this happens, certain clients(presumably the ones with active  
sessions on the dead server) can no longer access the http server  
through the load balancer, while other clients have no problems.   
Once the dead server is brought back up all connection issues go  
away.  Any ideas why everything isnt failing over?  Another factor is  
that many of the connections are made through an ISA proxy (any  
compatibility concerns there?). Heres my config:

# Global Directives
checktimeout=10
checkinterval=5
fallback=127.0.0.1:80
autoreload=no
logfile="/var/log/ldirectord.log"
#logfile="local0"
quiescent=yes

#incoming standard web traffic
virtual=199.27.3.33:80
         real=192.168.124.6:80 masq
         real=192.168.124.7:80 masq
         fallback=127.0.0.1:80
         persistent=120
         service=http
         request="index.html"
         receive="Test Page"
         scheduler=wlc
         protocol=tcp
         checktype=negotiate

Thanks,
James


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