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Expose container ports on localhost not working


(Gabriel Machado) #1

Expected behavior

When I try to map a port from container to localhost, it’s suppose to work.

Actual behavior

Docker for Windows (1.12.0-rc3-beta18 b 5193) returns an error when I try to run a container with -p argument.

λ docker run -d -p 80:80 --name webserver nginx
Unable to find image 'nginx:latest' locally
latest: Pulling from library/nginx

51f5c6a04d83: Pull complete
a3ed95caeb02: Pull complete
51d229e136d0: Pull complete
bcd41daec8cc: Pull complete
Digest: sha256:0fe6413f3e30fcc5920bc8fa769280975b10b1c26721de956e1428b9e2f29d04
Status: Downloaded newer image for nginx:latest
docker: Error response from daemon: driver failed programming external connectivity on endpoint webserver (1126556fd2ac7779c12a8e7eab79f104a0d7f4b18d4ca85e9113ee1198729bf2): Error starting userland proxy: write /port/tcp: errno 526.


  • Diagnose ID CB8C3B08-EDDE-42BF-A29B-E0B1004C4F14/2016-07-05_19-29-46
  • Windows 10 build 1511

Steps to reproduce the behavior

  1. Installed Docker for Windows beta with default options.
  2. Run docker run -d -p 80:80 --name webserver nginx suggested by docs.

(Nicolas Bihan) #2

I just tested with Beta 18 and was not able to reproduce the error.
Did you have the settings set to expose localhost in Beta 17?

(Michael Friis) #3

Can you try disabling the localhost setting in Network settings? It might also be good to try a different port than 80 in case you already have a process bound there.


(Gabriel Machado) #4

Tried to debug a little more and worked in a different port:

docker run -d -p 8080:80 --name webserver nginx

IIS Express service was using port 80. My bad :slight_smile:

(Michael Friis) #5

Thanks for reporting this - I’ve created an issue to track improving the error message.

(Marvin Froeder) #6

FWIW, also had problems with “Expose container ports on localhost”

I’m using postgresql and I start having this error:
“error 08p01 invalid message format”

Disabling this experiment functionality “solved” the problem

Using Docker for Windows 1.12.0-rc4-beta19 build 5465

A diagnostic was uploaded with id: D7E2026D-F959-4B2A-A636-9D38762FD9A6/2016-07-18_10-28-12