Charter Communications

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.

These limitations do not apply to Charter Business accounts.

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.