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Can't map a drive - what port should I open?

Using forwarding options on my LinkSys router I am able to access the Web, FTP and copy files. But I also need to map a drive from the remote computer but so far I have been unable to do this.
Example: net use S =

What port should I open in my router?
You have to open port for NetBIOS – 137, 138, 139.

This was last published in July 2003

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