Security concerns on Internet connections

by Johannes Helmig [Published on 6 Feb. 1999 / Last Updated on 6 Feb. 1999]

Please be aware on a serious security issue, in case your system is connected to a local network and is also configured to use Dialup-networking for connection to the Internet.

As part of the setup of the local network, File-and-Print Sharing is installed in most cases, with sharing of the disk(s):

And on most private networks, passwords are usually not defined.

Lets have a closer look to the network configuration:

we need to check the combination "TCP/IP -> Dial-Up Adapter" (which is used for the Internet connections):

And this is the security problem: when installing "File-and-Print Sharing", then Windows configures by default a Binding (=connection) between each protocol (in this case the TCP/IP used for the Internet connection) with the "File-and-Print Sharing" !
Result: your system is wide open for connections FROM the Internet, everybody knowing your IP-address can now connect to your disk !

as minimum protection, define at least a Sharing password for your disk.
Better: do NOT allow a connection from the Internet to your local disk:

Un-check (= interrupt) the Binding between the TCP/IP protocol used on the Dial-Up adapter with the "File-and-Print Sharing".

For a higher level of security, you need to install a Firewall.


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