Socks4.x - Firewall Setting Center



	The Site People

SOCKS4.x is a protocol that relays TCP sessions at a firewall host to allow application users transparent access across the firewall.
Because the protocol is independent of application protocols, it can be used for many different services, such as telnet, ftp, finger, whois, gopher, WWW, etc.
Access control can be applied at the beginning of each TCP session; thereafter the server simply relays the data between the client and the application server,
incurring minimum processing overhead.

When to use Socks4.x?

Socks4.x may be used if your firewall blocks bi-directional TCP packets or does not allow an opened listening port. Socks4.x. may also be used if the firewall blocks the bi-directional TCP connections, ICQ will communicate with its server but users will not be able to communicate between themselves.
If your firewall does not allow for an open listening port, ICQ will work but users will not be able to communicate with other users that are behind a firewall with the same configuration. This is where Socks4.x comes in. It is designed to open a listening port on the Socks server, and redirect users to the client computer, and redirect the TCP packets from the client computer to the Internet.

Important :

The Socks4.x.server must have the ability to communicate with the Internet and your LAN freely, including the ability to open listening TCP port. In most cases this type of server has more than one LAN interface, one of them to the Internet, the others to the LAN. Your Socks server will behave as a gateway to the Internet.
The computer running ICQ must have bi-directional communication ability with login.icq.com port 5190TCP.
The computer running ICQ must also have a DNS server connection specified and configured correctly.
The port used for the DNS server is UDP 53.

Following is a list of Socks4.x compatible firewalls and operating systems:

Wingate (Windows 95/98/2000/NT)
Microsoft Proxy (Windows 95/98/2000/NT)
CMS proxy (Windows 95/98/2000/NT)
Nec Socks5.x (Unix, Windows 95/98/2000/NT)

Configuring settings for Socks4.x in the ICQ program

Open the ICQ Menu and select Preferences.
Select the Connection feature.
Click on the Firewall tab.
For Socks4.x Host insert login.icq.com
For Socks4 Port insert 5190
Place a check mark in the External Proxy IP box to enter address for your firewalls external server.
Place a check mark in the Use proxy to resolve hostnames box
Click the Apply button.

Note: Consult your system administrator if you have difficulty configuring any of these settings or use the Submit Form to contact our Technical Support Team.

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