There have been several allegations saying that ATT has blocked ports used by bitcoin, but the company has clarified that it isn’t doing so. “We do not block port 8333/tcp or attempt to block bitcoin nodes for our customers,” ATT told DSLReports. “Any customer experiencing a problem should contact ATT customer care.”
As it turns out, the issue originated from a post on the bitcoin developers mailing list, stating that bitcoin is being censored by ISPs.
Did ATT Ban Bitcoin?
The user claims to have spotted secret firewalls in ATT U-Verse DVRs. “The internet is being routed through a DVR/cable box, and they confirmed the DVR also has a firewall,” the post read. “To make this even more absurd they refused to turn the firewall off because it is their equipment. So effectively they can firewall any port they want even if the customer asks them not to, in the unlikely event the customer figures it out.” A Reddit thread has also been discussing this topic at length.
However, DSLReports writer Karl Bode pointed out that it isn’t in ATT’s interest to prevent access to bitcoin nodes. He added that the user probably just needs to reconfigure