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im sharing specific localhost:port# but i need some certain ppl to access it via browser, i there a way to set a password and user name so when users navigate to the url a small window will pop up asking for pass and username, on ubuntu 18.04

put on hold as unclear what you're asking by vidarlo, Eliah Kagan, karel, user.dz, Zanna Nov 9 at 14:53

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    What are you sharing? TCP/IP has no concept of authentication (well, IPSec, but it's not widely implemented for this purpose). Authentication is left to the application layer, so the mechanism would depend on what application you serve. – vidarlo Nov 9 at 10:41

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