Failed to open TCP connection to localhost:35729 (Cannot assign requested address - connect(2) for "localhost" port 35729)

[kdiogenes]

This error happen after starting the server, inside a docker container, and trying to access it in localhost:3333

This error is already reported in some projects puma/puma#1022 and has some hints here and there https://stackoverflow.com/a/45899937/977201

I was able to "fix" it by adding the option host: '127.0.0.1' to https://github.com/locomotivecms/wagon/blob/master/lib/locomotive/wagon/commands/serve_command.rb#L84

I think that the final fix must live in rack-livereload, but I didn't have the time to understand the solution in other projects, so I don't understand where it must live in rack-liverload. For the meantime, I'm opening this issue to help other and also get help.

[jfturcot]

If anyone else runs into that error when running wagon serve in the current Ruby Docker image (ruby:2.4.2), the solution is within the Stack Overflow post that @cerdiogenes posted here: https://stackoverflow.com/a/45899937/977201

You have to modify /etc/hosts and remove localhost from the ipv6 line.

From ::1 localhost ip6-localhost ip6-loopback to ::1 ip6-localhost ip6-loopback

Here is how I do it using sed:

cp /etc/hosts /etc/hosts.new && \
sed -i 's/::1\tlocalhost ip6-localhost ip6-loopback/::1 ip6-localhost ip6-loopback/' /etc/hosts.new && \
cp -f /etc/hosts.new /etc/hosts

I hope that this will help someone else.

[sebastienbeau]

Thanks for the tips, I have fixed my image that I use for wagon with that patch : akretion/docky-ruby@f4698d7