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Rogers does block some ports.

The ports associated with non-IP protocols for Netbios, NetBEUI (vis Microsoft networking protocols) are blocked at the CMTS to ensure that no one on your cable segment can see your system and so that malware spread through the non-IP protocols can't connect through windows systems.

They also block a few non-standard ports known for spreading malware.

Finally, Rogers blocks outbound port 25 (SMTP server) connections to any MSA (Mail Submission Agent) or MTA (Mail Transmission Agent) other than Rogers specific SMTP servers. This is to stop spam and virus botnets from spreading Spam and infected mails from Rogers customers.

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by sbrook See Profile