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rdl:
Tried again this morning - Pale Moon and Firefox both with NoScript and uBlock Origin installed but turned off. The browser just does a document GET and returns a 304 error. After about 6 or 7 reloads I did finally get the file with Pale Moon. Pale Moon is set to reject all cookies. Firefox rejects only 3rd party. After a bit of experimenting it seems I can get the file maybe 10-15% of the time, but mostly just nothing.
exe:
May be without cookies CDN thinks you are a bot.
amyk:
I've had problems downloading stuff from TI before (connections would just mysteriously time out), and if I switched to my secondary ISP it would work. But the https://www.ti.com/lit/ds/symlink/ne555.pdf direct link currently works. Looking at my proxy request logs I see that it actually tried 3 times to connect, the first two times the server appears to have closed the connection silently.
rdl:
I don't know what the CDN would be in this case. Both browsers show only sending request to TI.com for the pdf, neither NoScript or uBlock Origin show any other connections that could be blocked.

Tried again just now and see some evidence cookies are possibly involved. Firefox can get the file 4 or 5 times in a row, while Pale Moon cannot. However, that was not the case this morning even though settings have not been changed.
tooki:
So I've run into the problem now, trying to download https://www.ti.com/lit/ug/scyd013b/scyd013b.pdf on my MacBook.

Here's what we can rule out as being individually responsible:
- ISP and LAN: it fails on the MacBook, but works on my iPhone, using the same Wi-Fi (with cellular data disabled to ensure the iPhone isn't failing over to cellular, which it will do normally), so in isolation, it's not the ISP or LAN. HOWEVER, if I use my iPhone as a hotspot and let the MacBook tether to it, then it loads on the MacBook!!
- browser choice: it's the same in Safari, Chrome, and Firefox
- OS: since it works when changing ISP, it can't be the OS
- browser configuration (cookies, extensions, etc): since it works when changing ISP, it can't be configuration
- JavaScript: same with JS on or off
- DNS: I tried with my ISP and Google DNS, no change
- TI policy: since it works when changing ISP or device, it's not policy. Moreover, not all PDFs seem to be affected. I can load other TI PDFs just fine.
- referrer: same result whether by clicking a link, pasting in the URL, or attempting to download the URL directly

So clearly this is a very, very, very narrowly triggered issue. If I had to guess, a router configuration error somewhere at TI which only rears its head when a particular route is selected, and gets cached somewhere by something.
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