I have 2 CSS 11052 making server load balancing at layer 3 (with four web servers). I have a VIP addr to talk with clients and 2 FW1 "next generation) in Win200 servers between the CSS and the clients. My clients have some problems in the the establish of the session (http or https). When the session are established they work well.
With a sniffer near the client i saw the client send 2, 3, or more "syn" till they have the "synack" and the session are established.
With a sniffer between the CSS and the web servers i saw the "syn's" that are sent by the client and i saw "synack" for every "syn" till the session are established.
I am curious as to why you asked if ACL was enabled.
I have a similar problem where I have web clients that access the Internet via a 11050. The client sends a SYN, the web server responds with SYNACK, the client then sends ACK. However, a sniffer on the Internet side of the CSS shows the CSS dropped the final ACK.
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