504 error when trying to access https://view.yahoo.com/?

Why do I randomly get a 504 error when trying to access https://view.yahoo.com/ through my DSL router but if I switch to my cellular wifi it pulls right up? If I switch back to DSL the 504 error comes back. It was just working then suddenly stopped, I tried cell wifi and it works just fine. The only difference is... show more Why do I randomly get a 504 error when trying to access https://view.yahoo.com/ through my DSL router but if I switch to my cellular wifi it pulls right up? If I switch back to DSL the 504 error comes back. It was just working then suddenly stopped, I tried cell wifi and it works just fine. The only difference is the public IP and DNS.
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