I am experiencing a problem load balancing 4 Citrix-CSG servers on a Cisco CSS11506 running WebNS 7.40.0.04
We have 3 independent 3rd party clients which are destination natted to three different internal address, which are internally resolved to the VIP address of 10.139.15.20, Source address is unchanged . These clients are connected for about 8 hours a day.
The CSS is configured to round-robin between the four Citrix-CSG servers, but it appears to happily all work for approximately a month , then it appears that one of our 3rd party clients appears to be stuck to a single server (Citrix-CSG) according to the sho flows command and does not appear to round-robin, However the remaining two 3rd party clients appear to be round robin as normal
Do you have any suggestions why this would be happening?
The current config is as follows:
!************************** SERVICE **************************
I see you have configured "advanced-balance ssl"... Have you investigated the SSL session ID's being used for that particular client during all that time (month)? Your servers could be "re-using" the same SSL session ID for this client over and over indefinitely (a month)?
I have seen the opposite situation where the server was not handling the SSL session-id "re-use" option properly. Our servers were instead providing a bran new SSL session-id for the clients every 90 seconds, causing the clients to bounce from server to server because the CSS would not find a match in its SSL-sticky table and load-balancing would therefore take effect and cause the client to end up on a different server.
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