8 comments on “[solved] GNS3: 206-unable to create UDP NIO

  1. Another solution is to open your saved topology .net file and change the UDP port value from 10000 by default to 12000 for example or just change the value to 10001 as Firewall Engineer said

  2. I have the same issue, but after making the changes Firewall Engineers mentioned, i couldn’t open the previous .Net topology files yet.
    The workaround is to open the topology file for editing and make the following change also
    udp = 10001

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