Iridium- Direct Internet and PPP port blocking
Summary:

As from 1st June 2005, Iridium Satellite LLC will be blocking many TCP/UDP ports in an effort to help combat against malicious programs and viruses. This change to the Iridium service will not affect the majority of users of applications such as Email, Web-browsing or FTP for example. However, specalist equipment or applications may use uncommon ports which will cease to work.

 

Article:

Please find below a list of the ports and services provided by Iridum that will be blocked as of 1st June 2005. If you have an application or equipment that connects to the Internet using a port that is not listed, please contact the supplier of the equipment or application for a resolution to this.resolution to this.

 

 

Protocol Name

Port Number

Simple Functional Description

HTTP

80

Hypertext Transfer Protocol- Used for web browsing

HTTPS (Or SSL)

443

Secure Sockets Layer- Used for encrypted web browsing

FTP

21

File Transfer Protocol- Used for transferring data files to/from FTP servers

SMTP

25

Simple Mail Transfer Protocol - Used for Email

POP

110

Post Office Protocol - Used for Email

Telnet

23

Used to remote login to a remote computer

NTP

123

Network Time Protocol –Used to synchronize or update computer clocks

IMAP3

143

Internet Message Access Protocol- Used for Email

TCP

50

 

PPTP

 

Point to Point Tunneling Protocol –Used for encrypted point to point links across the Internet. Also know generically as a VPN or Virtual Private Network

RDC

3389

Terminal Service- Used by various operating systems for administrative purposes

UDP

32000

User Datagram Protocol –A communications protocol used by some computers

DNS

53

Domain Name Service- Used to resolve domain names to IP addresses

SSH

22

Used for remote login

 

Resolution:

Iridium is committed to supporting the use of its data services for legitimate purposes that benefit its subscribers.
This list covers the standard ports and protocols needed for access to theWorld Wide Web, FTP sites, E-mail services, VPN and Terminal Services, DNS, as well as Telnet and Time Synchronization protocols. Restrictions on non-standard TCP/IP ports are necessary to ensure that Iridium networks are not being unknowingly used for propagating computer viruses and other malicious activity. Iridium reserves the right to modify the list at will.
Access numbers affected by this are 8816000021, 8816000022, and 8816000023.