Geremia's profile

Geremia

New Contributor

 • 

30 Messages

Closed

Which incoming ports are not open for Cox residential users?

Which incoming ports are not open (blocked) for Cox residential users?

Discussions

 • 

Updated 

10.8K

4

0

0

V

vegasmar6

Contributor II

 • 

79 Messages

Incoming ports 80, 25, and 21 are blocked. To prevent home users from running HTTP, FTP, and Mail servers from their residence. Business does not block these ports.

Update: Health Edge beat me to it as there is actually a support article describing each and every port and reason as to why it is blocked. Looks like 21 is not blocked for FTP.

*SMTP is only permitted outbound to Cox-provided SMTP servers. (For Port 25) (Example smtp.cox)

0

0

Accepted Solution

H

Health_Edge

+5 more

Valued Contributor III

 • 

4.2K Messages

Ports Blocked or Restricted by Cox High Speed Internet.

PortTransportProtocolDirectionReason for Filtering
25 TCP SMTP Both* SMTP Relays
80 TCP HTTP Inbound Web servers, worms
135 UDP NetBios Both Net Send Spam / Pop-ups, Worms
136-139 UDP, TCP NetBios Both Worms, Network Neighborhood
445 TCP MS-DS/ NetBios Both Worms, Network Neighborhood
1433 TCP MS-SQL Inbound Worms, Trojans
1434 UDP MS-SQL Inbound Worms, SQLslammer
1900 UDP MS-DS / NetBios Both Worms, Network Neighborhood

http://www.cox.com/residential/support/internet/article.cox?articleId=cacf82f0-6407-11df-ccef-000000000000

PS. FTP(21) is NOT blocked to best of my knowledge.

0

0

G

gabeo

New Contributor

 • 

2 Messages

Um...80 is not blocked for me

0

0

C

ChrisL

Former Moderator

 • 

7.1K Messages

Inbound TCP 80 is blocked for all inbound connections.  This does not apply to replies to outbound requests on port 80 as how that would block www access.

0

0