I have 2-layer web load balancing. First layer are the WEB Front-end servers and second layer Application servers. Communication goes "client" - "Web Front-end servers farm" - "Application servers farm" - "DB servers". I have 11501 CSS team for the Front-end servers and another team of CSS 11501 for the back end. While the load balancing of the front-end works as expected the load balancing at the second layer of CSS fails due to the IIS6 re-using the same ports for sending the requests to the App. Servers farm VIP and once the Front end get matched to a server on the back-end the CSS sticks the connection to it forever even tough I have no stickiness enabled at the back-end CSS.
Could any body give me a hint how to get out of this magic circle?
When i sniff the traffic the IIS never sends [FIN,ACK] nor [RST,ACK] packet. I created a script that looks for special word in the reply page to identify the server it comes from so here are the reports from few tests when i go trough IIS:
DRC1: 311 DRC2: 0 DRC3: 310 DRCSorry: 0
DRC1: 660 DRC2: 0 DRC3: 0 DRCSorry: 0
DRC1: 328 DRC2: 332 DRC3: 0 DRCSorry: 0
DRC1: 264 DRC2: 269 DRC3: 127 DRCSorry: 0
DRC1: 318 DRC2: 215 DRC3: 107 DRCSorry: 0
DRC1: 300 DRC2: 229 DRC3: 91 DRCSorry: 0
DRC1: 317 DRC2: 318 DRC3: 0 DRCSorry: 0
Also i used WMI script. from my desktop to test it. There i see [SYN] at the begining of each request and[RST,ACK] at the end as well as each request increments the port it is comming off of. Here is how the CSS act in this situation:
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