Charter Communications

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The primary provider for off-campus broadband connections in Houghton, Michigan.

Residential accounts are known to have the following ports blocked:

  • 21 (FTP)
  • 23 (TELNET)
  • 25 (SMTP)
  • 80 (HTTP)
  • 110 (POP3)

Some sources say that if an email server is detected on a residential account, the internet connection will be stopped entirely.

Users of Charter Business accounts do not have such issues.

AT&T (formerly SBC (formerly Ameritech)) also provides DSL service in the area. SBC also blocks outgoing port 25 (SMTP), but does not block other services.

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