This has been an ongoing concern for me for the past year. Every t.co link fails every time, this is not an intermittent fault. Puzzlingly it only fails when using a mobile network and works reliably over wireless.
Attempts to resolve the link either hang with no response, or eventually fail with 504 Bad Gateway Timeout.
So far I have tried:
3 phones, 4 OS/versions (iOS, 3 versions of Android), 3 browsers, 2 mobile networks.
Other link shorteners (bit.ly, p4k.in, etc) all work flawlessly—only t.co links fail.
Any assistance will be appreciated.