I am load-balancing a web HTTP server (Apache) with a Cisco 3640 and SLB. Up to release 12.4.8a(LD) it was OK (almost, in the sense, accepting IOS SLB's limitations).
Since I have upgraded to 12.4.10(LD) I started experiencing problems when accessing the site from behind a Proxy (Microsoft) and getting the following error:
"Network Error (tcp_error) A communication error occurred: "Operation timed out" The Web Server may be down, too busy, or experiencing other problems preventing it from responding to requests. You may wish to try again at a later time"
If the site is accessed directly instead, it responds OK. But ... if I power-cycle the router, I can connect again from behind the proxy, at least for a while. I do not have access to the Proxy server or configuration that fails to connect.
There must be something wrong with IOS 12.4.10 SLB dropping connections but, I cannot make the problem to occurr when debugging with a direct connection, nor I can find anything wrong with "show ip slb ...."
Has anyone else experienced anything similar?