IOS slb problems

[erkki]

Hi everybody.

Has anyone tried to get Cisco IOS slb (Server Load Balance) protocol to work?
I have a Catalyst6506 with Supervisor720 module operating as a router.
IOS version is 12.2(17a)SX1


#######conf snip################
ip slb serverfarm SERVERFARM1
real 193.40.5.244
reassign 2
faildetect numconns 4
retry 20
inservice
!
ip slb vserver SMTP
virtual 193.40.5.25 tcp 25
serverfarm SERVERFARM1
idle 120
delay 5
inservice
!
#############

The real server as loopback address 193.40.5.25

Well and if I telnet from some PC to 193.40.5.25 port 25, it directs me to the real server but after a few seconds drops the connection. If I do
#show ip slb stats
Connections Created: 13
Connections Established: 0
Connections Destroyed: 13

As you can see none connections are established. Smth is wrong. Could anybody help me out please?

Regards,
Erkki Kukk
University of Tartu