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Computers running their own servers (HTTP, FTP, or SMTP, for example), allowing Windows file sharing, or running programs that provide file sharing capabilities such as Instant Messengers (AOL's AIM, MSN Messenger, etc.) may have vulnerabilities similar to those described above. These programs and services may open a network port giving attackers a means for interacting with these programs from anywhere on the Internet. Vulnerabilities allowing unauthorized remote entry are regularly found in such programs, so they should be avoided or properly secured. A firewall may be used to limit access to open ports. Firewalls are widely used in practice, and they help to mitigate the problem of remote Trojan insertion via open ports, but they are not a very impenetrable solution, either. The following tool can be used to identify any open ports: »/scan
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