title: Error starting userland proxy: listen tcp 0.0.0.0:2049: bind: address already in use
body: <p>On Ubuntu 18.04, I'm trying to install <a href="https://github.com/hyperledger/cello" rel="noreferrer">Hyperledger Cello</a>, and during the install, I get:</p>
  
  <pre><code>make[2]: Entering directory '/home/julien/cello'
  docker-compose -f bootup/docker-compose-files/docker-compose-nfs.yml up -d --no-recreate
  WARNING: Found orphan containers (cello-user-dashboard, cello-operator-dashboard, cello-watchdog, cello-keycloak-server, cello-parse-server, cello-dashboard_rabbitmq, cello-mongo, cello-keycloak-mysql, cello-engine) for this project. If you removed or renamed this service in your compose file, you can run this command with the --remove-orphans flag to clean it up.
  Starting cello-nfs ... error
  
  ERROR: for cello-nfs  Cannot start service nfs: driver failed programming external connectivity on endpoint cello-nfs (d1be7a4999731983a12df9f1fb6484c7adf669be7edf01c6d962856ed8a6846f): Error starting userland proxy: listen tcp 0.0.0.0:2049: bind: address already in use
  
  ERROR: for nfs  Cannot start service nfs: driver failed programming external connectivity on endpoint cello-nfs (d1be7a4999731983a12df9f1fb6484c7adf669be7edf01c6d962856ed8a6846f): Error starting userland proxy: listen tcp 0.0.0.0:2049: bind: address already in use
  ERROR: Encountered errors while bringing up the project.
  </code></pre>
  
  <p>When trying to figure out which application is using 2049 port, I do:</p>
  
  <pre><code>➜  cello git:(master) ✗ sudo netstat -pna | grep 2049
  tcp        0      0 0.0.0.0:2049            0.0.0.0:*               LISTEN      -                   
  tcp6       0      0 :::2049                 :::*                    LISTEN      -                   
  udp        0      0 0.0.0.0:2049            0.0.0.0:*                           -                   
  udp6       0      0 :::2049                 :::*                                -                   
  unix  3      [ ]         STREAM     CONNECTED     204951   18122/brave --type=  
  unix  3      [ ]         STREAM     CONNECTED     204950   5193/brave           
  </code></pre>
  
  <p>But I get no app name.</p>
  
  <p>I also tried to remove containers with </p>
  
  <pre><code>docker rm -f $(docker ps -aq)
  </code></pre>
  
  <p>like said in <a href="https://stackoverflow.com/questions/37971961/docker-error-bind-address-already-in-use">this post</a>, but it didn't work.</p>
  
  <p>How should I do to free this port ?</p>