Application Web Pages Not Being Served Correctly by F5

I've tried these tools. But tools only show my what I already know: Browser sends requests to the page sources but some answers sometimes do not come back. I see trend: more client = bigger resources load problem.

Just to be clear, what you're looking for are 1) the resource requests themselves, and 2) how the objects in the documents are being referenced. It's unfortunately a VERY common problem when an otherwise internal app references objects and other resources by names that an external client cannot access. I've even seen this inside of JavaScript and style sheets. Please verify that the objects being requested are accessible externally (by name and resolution).