VPN and Coffee shop

Discussion in 'Mac Basics and Help' started by max2, Oct 30, 2018.

  1. max2 macrumors 68030

    Joined:
    May 31, 2015
    #1
    Is it possible a coffee shop can disable or prevent VPNs from connecting to it?

    WiFi works without VPN otherwise
     
  2. jeremysteele macrumors 6502

    Joined:
    Jul 13, 2011
    #2
    It is possible. I've been to hotels that have pulled nonsense like that before. The usual ways they do it are:
    • Blocking specific outgoing ports used by your VPN (by far the most common way)
    • If they provide DNS via DHCP, they can block requests to your VPN's hostnames
    • Detect and prevent packets with security handshakes - which would essentially stop you from have a secure connection anywhere.
    Why they do it, I dunno. But it is technically possible.
     
  3. max2 thread starter macrumors 68030

    Joined:
    May 31, 2015
    #3
    Thanks anyway around it?
     
  4. maflynn Moderator

    maflynn

    Staff Member

    Joined:
    May 3, 2009
    Location:
    Boston
    #4
    Yes, use cellular data and not use the free wifi. Its their wifi, and their rules ¯\_(ツ)_/¯
     
  5. max2 thread starter macrumors 68030

    Joined:
    May 31, 2015
    #5
    That what I did!

    Found a way around it though! :)
     
  6. simmonsj macrumors newbie

    simmonsj

    Joined:
    Aug 24, 2010
    Location:
    Newcastle upon Tyne, UK
    #6
    A lot of VPNs will use standard internet ports - most likely 443 for a secure connection (there may be some UDP ports required too). Coffee shops will have 443 open otherwise you couldn't hit a secure website (but they could block it in other ways as described above)

    Not every VPN uses these ports though so if the coffee shop has blocked other ports then you might have problems. I know one free VPN product I've used before didn't use port 443 (there was a paid-for version of the product that enabled that. ofc.)
     

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5 October 30, 2018