![]() ![]() If the system you are referring to is simply a PC as opposed to a server, you can probably get by using a host-based firewall, such as ZoneAlarm, to block all connections that don't originate from the PC. E-mail servers need ports 25 and 110 for SMTP and POP, respectively. For example, a Web server doesn't work very well with ports 80 and 443 blocked (unless you've mapped the http services to other ports). On the other hand, depending on what your system is used for, you likely have to have some open ports in order to be useful. ![]() Having any open ports exposes you to potential attacks that might exploit known or yet-unknown vulnerabilities. That way you are sure that all NetBios traffic originates from within your own network. ![]() Most networks that use NetBios and connect to the Internet also have a firewall that blocks incoming traffic on port 139. If you are not on a network using NetBios, there is no reason to have that port open. If you are on Windows-based network that is running NetBios, it is perfectly normal to have port 139 open in order to facilitate that protocol. ![]()
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