Another major issue that plagues large computer networks is performance degradation. Because of the size and scope of large networks with extra distance, more endpoints and additional midpoint equipment, many large computer networks face problems with slow speed and the loss of data integrity.
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The thing is, everything else works fine on my network and computer and I also know it's not an issue with my account as I can play just fine on Geforce NOW
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It still could potentially be an issue downstream that is preventing you from accessing the destiny servers appropriately. GeForce Now working doesn’t mean much since the server the game is running from to access the Destiny servers is somewhere else (as far as I understand it). You could try accessing some other free DNS hosts to see if that helps. But if it all of a sudden stopped working it sounds like a Internet/isp issue, failing hardware or a bad install but you said you reinstalled. As someone else said I had this problem once only with Destiny and it turned out my ISP had some issues and it was causing my upload to be extremely low and volatile. Other games seemed to work but I just had to wait for their issue to get corrected.