Forum Discussion
If I may add, if your Hosts file entry wasn't correct, and you weren't pointing directly to the VIP, then you wouldn't be getting a 404 response. This error indicates that you're asking for something that the server thinks does not exist.
The bad news is, there can be a myriad of reasons why an application server might generate this message, aside from an actual "file not found". The best way forward, I believe, is to:
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First validate that requests are actually making it to the web server through the F5. This is a simple tcpdump to watch traffic on the internal getting to the server. If that's good, then
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Inspect the client side of the HTTP dialog. Look at what the client is asking for and what the server is sending. You may find that the server is sending references to page objects using an internal URL.
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Finally, look at the web server logs. You should see the requested object and the 404 status.